Plyometrics (Definition)

Plyometric training (sometimes "jump training" or, historically, "shock training") consists of exercises that exploit the stretch-shortening-cycle (SSC): a rapid eccentric loading immediately followed by an explosive concentric action. The aim is to increase the speed and force of muscular contraction — i.e., power and rate of force development — by improving the muscle's ability to store and reuse elastic energy and to recruit the stretch reflex.

The defining feature is the rapid coupling (amortization) between landing/loading and the next push-off: the shorter that transition, the more the elastic and reflexive contributions are preserved. Classic lower-body plyometrics include jumps in place, standing jumps, multiple hops/bounds, box jumps, and depth jumps; upper-body plyometrics include plyo push-ups and medicine-ball throws.

Plyometrics bridge maximal strength and sport speed: strength provides the force ceiling, plyometrics teach the athlete to express that force quickly. They are intense, neurally demanding, and joint-stressful, so they require readiness prerequisites (strength, technique, body-mass considerations), appropriate surfaces and footwear, controlled volume (foot contacts), and adequate recovery between sessions.

• Plyometrics = exercises using a fast eccentric pre-stretch → explosive concentric (the SSC).
• Goal: greater power and rate of force development; better elastic/reflex energy use.
• Defined by a short amortization (coupling) time.
• Bridge maximal strength and sport-specific speed/jumping.
• High-intensity and joint-stressful — require prerequisites, controlled volume, and recovery.

• stretch-shortening-cycle — the physiology plyometrics trains.
• plyometric-phases — eccentric → amortization → concentric.
• plyometric-intensity-levels — low-to-high progression of drills.
• plyometric-volume-guidelines — foot-contact dosing.
• plyometric-prerequisites — readiness criteria before starting.