What is the definition of plyometrics?

Plyometrics refers specifically to exercises that involve a quick muscle stretch (eccentric activity) immediately followed by a rapid contraction (concentric activity). This training method is designed to enhance power, speed, and overall athletic performance by increasing the efficiency of the muscle's ability to produce force. The quick change from the eccentric phase to the concentric phase helps improve the muscle's explosiveness, which is crucial in many sports.

In contrast, other training methods such as slow, controlled strength exercises focus on building muscle strength without the explosive element, endurance training concentrates on increasing stamina over longer periods, and aerobic activities typically emphasize sustained cardiovascular fitness rather than the rapid, forceful contractions characteristic of plyometric exercises.