The Nature of Speed – Enhancing Sprint Abilities
The Nature of Speed
Enhancing sprint abilities through a short to long training approach.
By: Brad H. DeWeese EdD, Matt. L. Sams, MA, Joel H. Williams, Chris Bellon, MS
The desire to outrun the competition is a trademark of many sporting endeavors. While there is compelling evidence sprint speed is ultimately limited by an athlete’s genetics (Vincent et al. 2007), optimal training can improve their competitive chances (Ahmetov et al., 2011, Gineviciene et al., 2011, Niemi & Majamaa et al., 2005, Scott et al., 2010). Interestingly, while continuing research efforts have refined our knowledge on the founding constructs of speed, the practical utilization of this information with regard to sound programming methods attempting to maximize sprint ability have received little commentary. Therefore, the purpose of this article is to introduce a theoretical model for the planning of speed development, namely the short to long (S2L) approach to program design.
1.1 A BRIEF OVERVIEW ON PROGRAMMING TACTICS
While a detailed discussion on training theory is beyond the scope of this paper, an overview on periodization and program-ming is provided to further support the need for properly aligned fitness phases. In the performance setting, the design of a practice and competition plan is guided by the tenets of periodization. Specifically, periodization has been defined as the strategic manipulation of an athlete’s preparedness through the employment of separate, yet sequenced training phases. These training phases are established to mature various fitness qualities in a timely manner through a cycled and staged workload. Generally, these sequenced training phases graduate from a more general scope to a specific aim as the athlete nears the crux of competition. In addition, the workload undulates in a manner that balances the relationship between training-induced fatigue and accommodation (DeWeese et al., 2013).
To adhere to the tenants of periodization, coaches can choose from a variety of programming methodologies. These programming tactics are similar in that most advocate a variation of the workload throughout the training year so that competitive abilities are maximized. However, a primary variance within programming “philosophies” is how fitness phases are blended. For instance, traditional programming advocates that periods of training should be developed to enhance singular components of fitness (work capacity, strength endurance, strength, power), ultimately building toward a major competition. Unfortunately, modern competition schedules prevent this long, deliberately unilateral development pattern.
Evolving from this traditional model, Block programming attempts to address a more dense competition schedule by merging a traditional approach with briefer periods of “fitness phases.” These blocks of time allow for the accumulation, transmutation and realization of a fitness parameter (Issurin, 2008). Similar to the traditional model, adopters of a block system develop specific components of fitness through the incorporation of “concentrated loads.” Concentrated loads are defined as short periods of time (typically four weeks) where one training quality is emphasized. In other words, most of the training time is spent on improving that lone parameter (for instance, acceleration). These segmented blocks of priority are then aligned in a complementary manner in hopes of bolstering future periods of time as competition nears. These blocks could then be cycled as an athlete prepares for a subsequent competition.
Building from block, an advanced method of programming aims to enhance competitive ability through a more strategic addition and retention of fitness phases. Conjugate Sequential programming parallels block programming with the utilization of concentrated loads, but further supports the retention of previously developed fitness qualities through the adoption of “retaining loads.” These retaining loads are established to either maintain the previous block’s agenda or introduce a future block’s concentrated load. For example, while a coach may concentrate the load on the development of maximum velocity, they may choose to maintain accelerative abilities with reduced volumes. In addition, a coach may prescribe minimal practice volumes to introduce top-speed endurance as a tertiary goal. These primary, secondary, and tertiary goals are established in such a way that the athlete is prepared for a dense competition schedule and is never too far removed from their optimal level of readiness.
1.2 CONJUGATE SEQUENTIAL PROGRAMMING FOR SPEED
Within the world of speed development, there are two traditionally supported avenues in the training process: “long to short” and “short to long.” Long to short (L2S) essentially describes a method of enhancing speed that begins with longer sprint distances that decrease in length as the training year progresses. In addition, an athlete training in a L2S program will typically see their prescribed training speeds gradually increase as the repetition distances shorten. The overarching belief is that a L2S program provides an athlete the opportunity to enhance their work capacity (“base”) before taking part in more specific efforts. Proponents of L2S argue that the improved work capacity leads to refined physiological and metabolic conditions such as lactate clearance, capillarization, and resynthesis of Creatine Phosphate (Weston et al., 1996, MacDougall et al., 1998, Forbes, Slade, & Meyer et al., 2008). As a result, the athlete taking part in long training at the beginning of the season can efficiently exert more work at high intensities, and in theory, possesses a body that is more resilient against fatigue. This design may improve an athlete’s power endurance or ability to run within a given zone or pace (Billat, 2001a & 2001b).
In contrast, short to long (S2L) refers to a training program that emphasizes shorter sprint distances at the beginning of the year, followed by a lengthening of repetition distances as the training season matures. Advocates of this system contend that speed cannot be built off of endurance; rather, maximum velocity is the result of a refined ability to accelerate. In other words, if an athlete can extend their acceleration zone, they may reach a higher terminal velocity later in the race. This higher top end speed would perhaps provide a greater point from which to “drop” at the onset of fatigue.
From here, speed endurance may be optimally developed from the creation of a “speed reserve.” The creation of a speed reserve suggests that successful longer-distance sprints, (200-400m competitive distances) are the result of running segments of the race at a velocity that is lower than the absolute maximum that could be achieved in a shorter race (60m-100m). In essence, the speed reserve is the culmination of a training process that first creates higher running velocities which then allow the athlete an opportunity to run longer sprint distances at a “submaximal” pace. This theory has gained support from Weyand and colleagues (2003, 2005) who have demonstrated that a reduction in sprint performance is not the result of cellular energy availability but is related to muscle force output, which diminishes as sprint distance increases.
2. FOUNDATIONAL CONSTRUCTS OF SPEED
As Ross, Leveritt, & Rick (2001) remind us, successful performances in the sprint events are based on an athlete’s (1) ability to accelerate, (2) magnitude of maximum velocity and (3) ability to maintain velocity against the onset of fatigue. As such, it can be inferred that an athlete who accelerates well can attain higher velocities during the “top speed” portion of a sprint when training provides an optimal stimulus for the neurological and metabolic systems. Irrespective of training philosophy, it can be demonstrated that gravity, wind and ground reaction forces work to limit the sprinting athlete (Hunter, Marshall, & McNair, 2005). Of these three aforementioned factors, ground reaction force (GRF) is the only variable that can be controlled by the athlete. In short, GRF are the forces exerted by the ground on a moving body.
Within speed development, manipulations to GRF can be made through corrective changes in a sprinter’s biomechanics. In other words, a sprinter’s ability to properly direct force into the ground and subsequently receive and utilize reactive forces may be improved through training and optimized biomechanics. These biomechanical efficiencies can be enhanced and stabilized through the correct staging of speed and strength development strategies that seamlessly blend together through phase potentiation. As the late Charlie Francis stated, “Absolute strength, strength balance, and power must be developed before an athlete is able to get into the sprint position” (Francis, 1992).
2.1 FORCE DELIVERY
Sprinting is best described as a volitional activity that represents how fast an athlete can displace their mass in a linear direction through a rapid, un-paced, maximal run that lasts less than 15 seconds (Ross et al., 2001). This rapid locomotion requires the swift production of force. Specifically, much research has demonstrated that effective sprinting is largely the result of high rates of force development (RFD) which can be defined as the change in force divided by the change in time (Stone et al., 2003). Weyand and colleagues (2000, 2010) have demonstrated that elite sprinters separate themselves from their slower counterparts through the production of high forces within a minimal ground contact, or stance phase. In other words, an accomplished sprinter will spend less time on the ground than their competitors.
During this abbreviated ground contact, better sprinters utilize higher force production to displace their body horizontally down the track, which can be described as their stride length. Interestingly enough, while leading to a greater stride length, this shortened stance phase and delivery of force into the ground does not result in a more rapid recovery of the swing leg in faster sprinters (Weyand et al., 2001). In fact, sprinters of both elite and average levels demonstrate similar rates of recovery between steps.
Furthermore, due to large amounts of force production, elite sprinters tend to leave the ground quickly at toe off (Mann, 2013) preventing triple extension when observing the “back side mechanics.” This quick, forceful foot-strike allows the legs to turnover more frequently. This biomechanical advantage results in a faster stride rate, which provides a more continuous opportunity to place force into the ground. While sprinters spend most of their time “above the track,” the only way you can continue horizontal movement is through rapid, ballistic force production.
Perhaps as a result of the longer stride length and shorter foot strike, better sprinters demonstrate greater hip flexion at the terminal portion of the recovery phase which may provide a greater angle of attack during the upcoming ground contact. This is commonly noted as the “higher knee” of what is termed the “front-side” portion of sprinting mechanics that provides the sprinter with a chance to properly direct vertical forces into the ground during foot contact (Mann 2013, Clark 2014). Moreover, coaches anecdotally describe the sounds of a fast sprinter’s foot strike as sounding like a large “pop” or “bang” which supports the forceful impact as a result of optimized leg positioning.
(See Figure 1)
3.0 MUSCULAR MECHANISMS
This optimized delivery of force and quick ground contact allow the sprinter to take advantage of the stretch-shortening cycle (SSC), which can be described as the rapid and forceful lengthening of a muscle-tendon complex followed by an immediate shortening or contraction (Komi, 2008). This provides efficiency of movement, which may result in a more economical usage of ATP and energy substrates (Weyand, Lin, & Bundle, 2006, Bundle & Weyand, 2012), along with minimized changes in hip height and subsequent braking forces.
Conceptually the SSC is important for sprinting as it underpins the spring-mass model (SMM). The SMM depicts sprinting as the result of a body mass bouncing along two springs (Blickhan, 1989, Dalleau et al., 1998, Dutton & Smith, 2002, Farley & Gonzalez, 1996). During a complete running cycle, one spring compresses and propels the sprinter’s body forward. Simultaneously, the other spring swings forward in preparation for ground contact. Within an upright sprint, compression of the spring begins at foot strike, which results in horizontal braking forces. This sudden deceleration assists in propelling the swing leg forward in preparation for the following step. As the center of mass moves ahead of the stance foot, the sprinter enters the “mid-stance” phase. Within the SMM, the spring is compressed to the lowest point, which coincides with a lowered center of mass at mid-stance. Finally, the push-off (toe-off) segment of the stance phase describes the return of energy through the extension of the coiled spring. This return of force projects the sprinter forward into the next step.
While the SSM provides a conceptual framework for highlighting the actions involved in upright sprinting, recent work suggests that there are limitations to the model’s ability to describe the stance phase of elite sprinters. Specifically, Clark (2014) demonstrates that elite sprinters produce most of their vertical forces in the first half of a ground contact. In comparison, the stance phase of an average sprinter tends to yield a force curve more symmetrical in shape. Therefore, the ability to describe an elite sprinter’s stance phase through the SSM is limited. The SSM can, however, continue to be used as a means of describing the relationship between the SSC, muscle stiffness and sprinting.
3.1 NEUROMUSCULAR STRUCTURE
The production of high vertical forces while sprinting is ultimately dictated by the muscle’s ability to contract. It is well documented that contractile capability is strongly related to muscle fiber cross-sectional area (CSA) (Edgerton, Roy, & Gregor, et al., 1986, Gollnick & Bayley, 1986, Hakkinen, 1989, Cormie, McGuigan, &, Newton, 2011). In other words, the greater size of a muscle fiber may associate with a greater ability to produce force. This is evident when comparing type I and II muscle fibers, as type II fibers increase in size to a greater degree than their type I counterparts (Staron et al., 1994). With respect to performance, type II fibers have been shown to display higher force production (Shoepe et al., 2003) and contractile velocity (Faulkner et al., 1982) when compared to type I fibers. These performance characteristics are further directed by sarcomere alignment within a muscle fiber.
A sarcomere is the basic contractile unit that causes a muscle to shorten. Sarcomeres can be organized into “parallel” or “series” arrangement. While parallel sequencing favors force production, series arrangement affords greater shortening velocities. The status of sarcomere order is reflected in muscle pennation angle (PA) and fascicle length (FL). Greater PA is associated with a greater number of sarcomeres in parallel alignment, while longer FL reflects superior series alignment. In addition to a greater number of type II fibers (Costill et al., 1976), sprinters have been shown to possess greater FL (Abe, Kumagai, & Brechue et al., 2000) in comparison to other athletes.
While these characteristics provide the high forces required for sprinting, they are ultimately underpinned by the neurological status of the athlete. More specifically, muscle fibers have been show to take on the qualities of their associated motor neuron (Buller, Eccles, & Eccles et al., 1960). Therefore, the characteristics of the neuron innervating a muscle fiber can be considered the primary determinant of a muscle’s contractile capability.
Contractile properties are influenced by the speed at which a neuron can transmit an electrical impulse to the muscle. Simply put, the faster a nerve can send a signal to the muscle, the faster and more frequently it can shorten. Neurological adaptations such as increased axon diameter, myelination and dendritic branching can enhance the nerve’s ability to transmit an impulse to the muscle (Gardiner & Heckman, 1985, Gardiner, 1991). This improved transmission provides the athlete a greater capacity to express higher forces over a shorter period of time. As a result, a sprinter may be able to apply higher rates of force during the short ground contact times associated with elite speed.
4.0 RELATING THE NATURE OF SPEED TO PROGRAMMING
A sprinter’s physiological architecture, though largely shaped by genetics (Vincent et al., 2007), can be enhanced through proper training (Aagaard et al., 2001, Blazevich et al., 2003, Nimphius et al., 2012). This training template should attempt to honor the tenets of periodization with distinct phases dedicated to concentrated loads while also serving to merge the past, present and future through retaining loads. This conjugation and sequencing of fitness phases is done to promote an athlete’s ability to produce, tolerate and sustain the production of high vertical forces within a short period of time.
Through an early emphasis on acceleration, a sprinter may improve the biomechanics and propulsive force-generating/ delivering mechanisms (neuromuscular architecture), which then serve to support and bolster their top speed. Once the athlete begins to dedicate training time for the maturity of maximum velocity, they will have benefited from the previous investment in force production, which may allow them to attain: preferred sprinting positions (shoulders stacked on hips, hips stacked on ankles) during the stance phase, optimized hip angles at the terminal portion of the recovery leg, the maintenance of a high hip height, a more proximal foot strike at initiation of stance phase, employment of the SSC and muscle stiffness, higher force production at the onset of stance phase, abbreviated ground contact time.
From this point, the athlete can continue to improve their chances over longer competitive distances in subsequent periods of training by taking advantage of their newly developed speed reserve. The speed reserve, which is the result of a higher terminal velocity, allows the athlete to preserve sprint mechanics by running long sprints (speed endurance) at a prescribed pace. This training technique also provides benefit as it may prevent the unnecessary exposure to poor sprint mechanics and motoneuron control/ feedback.
(See Figure 2)
4.1 BREAKING DOWN SPEED THROUGH AN ANNUAL PLAN
Preparing a sprinter for success in competition requires forethought and deliberate planning. In other words, the coach should create an annual plan using the tenets of periodization as a guide. Recall that periodization is a term that describes the movement from general to specific training aims, where phases are cycled and staged as the workload varies in order to allow for adaptation and competitive readiness. Generally speaking, most coaches build the annual plan by first including the competitions, training camps and possibly travel dates. From here, the phases of training are loosely fleshed out based on the athlete’s level of readiness and trained state, which can be attained through testing, monitoring and interview.
Most often, all yearly plans begin with an emphasis on generalized development which serves to provide an athlete dedicated time to revisit and accumulate fitness characteristics that are reduced or compromised during the latter portion of competition and time off. The fitness characteristics that are typically accumulated during a general preparation phase (GPP) include but are not limited to:
• Work capacity
• Cross sectional area of musculature
• Mobility/ flexibility
• Strength/ power endurance
• Modifications in body composition
• Movement technique derivatives (parts of the whole movement)
Once the athlete has met the objectives of the GPP, more specialized training is implemented, typically coinciding with an increase of intensity and task-specificity. For this article, the Special Preparation Period (SPP) can also be termed the Pre-Competitive Period (PC) as the primary aim is to merge the previous phase of general training with the need for competitive readiness. Training within this time frame continues to fine-tune the previously listed fitness characteristics through the prescription of retraining loads, but places larger emphasis on practice sessions that impart greater transfer of training effect to the competition schedule (Young, 2006). In general, the following areas are addressed within an SPP/PC:
• Maximal strength/ Rate of Force Development
• Specialized endurance (specific to the event or sport)
• Introductory power development
• Whole movement technique
Ultimately, this training provides a catalyst for success within the Competition Period (CP). As the name denotes, this phase of training emphasizes practice schedules and exercise selections that further support and promote optimal readiness for race day. In addition, the volumes of training are generally reduced (in comparison to the entire annual plan) with an increase or maintenance of higher intensities. This is done with the premise that larger workloads may impede performance due to residual or lingering fatigue (McCaulley et al., 2009, Behm et al., 2002). Training tactics within the competitive period typically continue the efforts described within the SPP/PC but prioritize the following:
• Strength Speed/ Speed Strength
• Rate of Force Development
• Perfected movement technique
While the aforementioned information regarding phasic development of fitness characteristics is beneficial for most athletes, special attention must be made for the refinement of speed. For this reason, an outline of speed enhancement using a short to long approach is provided below.
4.2 GENERAL PREPARATORY DEVELOPMENT OF SPEED
Recall that elite sprinters produce high rates of force within a short stance phase. This abbreviated ground contact is related to a series of optimal biomechanics that allow for a “quick” toe off from one stance phase that ends with a “higher knee” at the terminal portion of a swing phase. This preferred position within “front side” mechanics allows for a rapid and more direct forceful punch into the ground. Therefore, it can be suggested that swift force production alongside sound running mechanics begets optimal sprinting. Considering this information, a sprinter may respond well to a training program that begins with an emphasis on mastering the acceleration phase.
Regardless of status, most sprinters begin the training year following a competitive period punctuated with a taper and a period of complete rest. This dramatic reduction in volume (and fitness) leads to a detrained state. Within sprinting, this detrained state could hypothetically include a reduction in the ability to produce high levels of force, power and movement economy. Acknowledging that maximum velocity is dependent on the ability to produce high rates of force through optimized biomechanics, a reinvestment in acceleration is justified.
One method of re-establishing or improving an athlete’s accelerative ability is incline sprinting. Through a subtle slope, a sprinter will be encouraged to produce greater propulsive forces in order to overcome the effects of the inclination, gravity and their body mass (Gottschall & Kram, 2005). This increased force production would come alongside possible improvements in biomechanics, including more aggressive arm action, knee drive and aggressive footsteps.
Upon completion of a block of training emphasizing incline sprinting, a coach can begin to reintroduce “flat-ground” sprinting through the prescription of resisted sprints (towing), which mimic the incline. The similarity between incline sprinting and towing is a continued requirement to produce greater propulsive forces, body lean and aggressive arm and leg action. In addition, lowered starting positions (e.g. push-up starts) can be implemented. These exercises exaggerate the acceleration phase through a drastic reduction in an athlete’s starting hip height. With the hips starting at a lower height, the athlete is placed in a position that not only necessitates high force production and leg drive, but also progressively introduces a longer “footfall”. Gradually increasing the distance the foot travels prior to ground contact organically re-acclimates the athlete to flat-ground sprinting.
In addition to the concentrated loading of acceleration, a sprint coach may prescribe low-volumes of slightly longer sprints in order to begin the development of speed endurance, which can be defined as a sprinting distance between 60-150m. This secondary aim could serve as a retaining load in order to set-up future training agendas. These agendas could include race-specific “pacing” and the development of a specialized work capacity.
(See Figure 3)
4.3 SPECIAL PREPARATION PRE-COMPETITION
Following a training period that emphasizes acceleration, the sprinter is now equipped with the tools necessary to begin top speed development. Since an athlete’s maximum velocity is dependent on their ability to produce and tolerate high rates of force through optimized biomechanics, the performance gains acquired in the GPP will lend support to specialized training aims.
Through the prescription of sprint distances that allow the athlete to express a taller posture, the improved force production should lead to a “higher and unwavering” hip position that sits directly under the shoulders and over the ankle at mid-stance. This stacked position provides ample room for the ideal hip flexion and resulting knee height that sets up a strong, vertical leg drive into the track. In addition, this hip and knee position provides the sprinter with clearance to plant the stance leg slightly ahead and underneath the hips. This optimal foot-strike pattern prevents an exaggerated deceleration and provides the sprinter an opportunity to take advantage of the SSC and SMM. In contrast, a weak sprinter will demonstrate higher decelerations immediately upon contact that may coincide with greater amplitude of the hips from step to step. As Dr. Ralph Mann describes, a weaker sprinter will vault into subsequent steps (Mann, 2014).
While maximal-effort sprints covering a distance of 40-60 meters allow for this upright running position to occur, sprint coaches have utilized many training tactics to further an athlete’s maximum velocity. Examples of this type of training include fly-in runs and race-modeling efforts. Fly-ins are a type of sprint that provide an athlete with a gradual build-up so that the athlete enters the “sprint” zone in an upright position and at or near their maximum velocity. Theoretically the sub-maximal buildup preserves force-generating ability through a limitation of neuromuscular fatigue. It should also be noted that the coach can control the velocities attained within the fly-zone by shortening or extending the build-up.
Race modeling is an additional tool used to advance an athlete’s maximum velocity. This type of training refers to a change in effort over a prescribed distance. A coach will create “speed change” zones and define them as “fast-easy-fast” or “fly-float-fly.” Regardless of distance, the athlete is advised to “build speed, accelerate or press” during the “fast or fly” zones. Once the sprinter enters the “easy or float” zone they are cued to “maintain inertia” or continue sprinting with relaxed, flowing form. In the practical setting, coaches report that the disinhibition allows the athlete to hit higher velocities as compared to the fast zones when they are volitionally attempting to build speed.
While this type of concentrated load is necessary for the continued development of maximum velocity, coaches should use conservative loading strategies and ample recovery within the session and immediately after. The neuromuscular fatigue generated from this type of training is similar to that coming from maximal efforts within competition and in strength-training (Mero & Peltola et al., 1989).
In conjunction to the emphasized focus on top speed, retaining loads can be adopted for the continued enhancement and maintenance of acceleration that was prioritized within the previous phase. Furthermore, a second retaining load could be used to highlight speed and special endurance runs that closely mimic longer sprint race distances. Of note, special endurance is a term used to define sprints that require a specific work capacity or pacing strategy. Special endurance runs can be categorized into two classifications based on a sprinter’s specialization (100200m runner or 200-400m runner). Special endurance 1 can be used to describe sprints covering a distance of 150m-300m, while special endurance 2 can describe a sprint ranging a length of 300-600m. Each type of special endurance requires pacing strategies that utilize an athlete’s speed reserve.
(See Figure 4)
Entering into the competitive period, a sprinter adhering to a S2L program would have fully developed their accelerative ability followed by a period of maximum velocity training. Coinciding with these phases would be a consistent exposure to progressively longer sprints that utilize the athlete’s speed reserve. These strategies aim to culminate in an improved competitive readiness with regard to the stabilization of optimal movement mechanics, force delivery, and work/ sprint capacity.
With regard to training, a coach may choose to use retaining loads of acceleration and maximum velocity training to compliment the competition schedule. Care should be given when prescribing higher velocity sprints as the neurological fatigue resulting from this type of training could interfere with race day readiness (Mero & Peltola, 1989). For this reason, the authors of this article suggest letting the races continue to develop & maintain top speed. However, during non-racing weeks, these practices can and should be utilized.
Lastly, the coach should attempt to further compliment the competition schedule by designing practice schedules that provide a stimulus that is not occurring frequently enough within the races. For example, if a long sprinter is being asked to race the 200400m often, focusing practices on acceleration or speed endurance may assist in the retention of the speed reserve and force delivery mechanisms.
(See Figure 5)
The competitive aim of sprint racing is to outpace other runners. As such, develop training agendas that build an athlete’s sprint ability through logical and evidence-based progressions. Considering that most of the research on sprinting suggests that racing success may be limited by force production, neuromuscular control and resultant biomechanical efficiency, a coach may find a short-to-long (S2L) approach beneficial.
The S2L methodology follows suit with block programming in which concentrated loads are used to bolster the performance of future training blocks. For example, a block of acceleration work may improve the outcomes gained from the next block of training time dedicated to maximum speed development. In addition, retaining loads of reduced volumes are used to maintain the skills and improvements made in previous blocks while also introducing future priorities to ease the transitions from block to block.
The adoption of a S2L strategy may also improve an athlete’s speed reserve, which has been demonstrated to play a role in long sprint events (Weyand, Lin, & Bundle, 2006, Bundle & Weyand, 2012). By increasing the rates and length of the acceleration, a higher maximum velocity may be attained. The increased velocity threshold may allow longer sprints to be run at a sub-maximal percentage that reduces neuromuscular fatigue that may impair an athlete’s ability to quickly produce, delive and tolerate high forces.
In conclusion, sprinters of all levels require exposure to practices that consistently afford them opportunities to maximize force production through efficient biomechanics. Furthermore, the coach should allow full recovery during the sessions since metabolic energy availability (conditioning) has not been shown to restrict sprint performance. A S2L approach may allow for the seamless development and refinement of sprint ability that can be used throughout an athlete’s career.
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