Sprinting is a plyometric activity. Every stride during a sprint uses the same stretch-shortening cycle that defines plyometric exercise: your muscles and tendons rapidly stretch under load, then immediately contract to produce force. In fact, sprinting is one of the fastest and most demanding plyometric movements the human body performs.
What Makes an Exercise Plyometric
A plyometric movement has one defining feature: an eccentric (lengthening) muscle action followed immediately by a concentric (shortening) action. This rapid stretch-then-contract sequence is called the stretch-shortening cycle. Jumping, bounding, hopping, and skipping all qualify, and so does sprinting. The stretch phase loads your tendons and muscles with elastic energy, and the shortening phase releases it, producing more force than a concentric contraction alone could generate.
Plyometric actions are categorized as either fast or slow based on how long your foot stays on the ground. Fast plyometric actions have ground contact times under 250 milliseconds, while slow ones exceed that threshold. Fast actions rely more heavily on elastic energy storage and involuntary stretch reflexes to generate power. Sprinting falls squarely into the fast category, with ground contact times far shorter than the 250-millisecond cutoff.
How Sprinting Uses the Stretch-Shortening Cycle
When your foot strikes the ground during a sprint, the muscles and tendons of your lower leg stretch rapidly under forces that can reach four to five times your body weight. Your Achilles tendon absorbs much of this impact, storing strain energy like a compressed spring. Within milliseconds, that energy is released as the tendon recoils, contributing to the propulsive force that drives you forward.
What makes this especially efficient is that your muscle fibers don’t have to do all the shortening work themselves. Research published in the Journal of Applied Physiology shows that the Achilles tendon, if optimally stiff, allows the muscle fibers to remain nearly isometric (holding their length) while the tendon handles most of the lengthening and shortening. This dramatically reduces the metabolic cost of each stride. Your tendons essentially act as biological springs, recycling mechanical energy that would otherwise need to come entirely from muscular effort.
This is the same mechanism at work during a depth jump or a box jump. The difference is that sprinting repeats it dozens of times in rapid succession, at extremely high velocities and forces.
Ground Contact Times During Sprinting
The speed of the stretch-shortening cycle during sprinting is remarkably fast. Elite sprinters at maximum velocity have ground contact times between 85 and 110 milliseconds. The fastest sprinters in studied groups have hit ground contact times as low as 85 milliseconds. For context, a blink takes roughly 150 milliseconds. Your entire plyometric cycle, from foot strike to toe-off, happens faster than you can blink.
These contact times place sprinting among the most demanding fast-SSC activities. Shorter ground contact is associated with greater reliance on elastic energy return, stronger stretch reflex contributions, and higher levels of neural activation. This is why sprint speed at maximum velocity is less about how hard you push and more about how quickly and stiffly your leg can absorb and redirect force, which is a fundamentally plyometric quality.
Force Demands Compared to Other Plyometrics
Sprinting generates enormous ground reaction forces. At top speed, peak vertical forces reach four to five times body weight. For a 180-pound runner, that means each foot strike briefly channels 720 to 900 pounds of force through the leg. These forces are comparable to or higher than many traditional plyometric drills like depth jumps, and they occur repeatedly across every stride.
This is one reason sprint training has a similar (sometimes greater) recovery demand compared to dedicated jump training. A study comparing heavy resistance training, jump training, and sprint training found that all three produced fatigue requiring up to 72 hours to fully resolve. Sprint and jump training both reduced voluntary muscle activation for about 24 hours post-session. Interestingly, the fatigue wasn’t primarily driven by central nervous system burnout, as is sometimes assumed. It was largely peripheral, meaning the muscles and tendons themselves needed time to recover from the mechanical stress.
Why This Matters for Training
Understanding that sprinting is plyometric changes how you should think about programming it. If you’re already doing box jumps, depth jumps, or bounding drills several times a week, adding high-intensity sprint sessions on top of that increases your total plyometric volume significantly. Your tendons, joints, and muscles don’t distinguish between a depth jump and a sprint stride. Both impose rapid, high-force stretch-shortening demands.
This also means sprinting can serve as plyometric training on its own. For athletes who find traditional plyometrics monotonous or impractical, sprint work develops many of the same qualities: tendon stiffness, reactive strength, rate of force development, and stretch-shortening cycle efficiency. Short sprints of 30 to 60 meters at maximum effort train the fast SSC in a way that closely mirrors the demands of most field and court sports.
Recovery planning matters here too. Given the 48 to 72 hours needed to fully recover from maximum-effort sprints, spacing high-intensity sprint sessions at least two days apart gives your neuromuscular system adequate time to rebuild. Stacking a heavy plyometric session the day after an all-out sprint workout compresses recovery windows for tissues that are already under significant mechanical stress.