muffintop-less:
Unlike typical strength training exercises that involve long, slow movements designed to increase muscular strength and mass, plyometric exercises involve quick, explosive movements designed to increase speed and power. A plyometric exercise consists of three phases. The first is a rapid muscle lengthening movement called the eccentric phase. Second comes a short resting period called the amortization phase. Finally, the athlete engages in an explosive muscle shortening movement called the concentric phase. The athlete repeats this three part cycle as quickly as he can.
The goal of plyometric exercises is to decrease the amount of time in-between the eccentric and concentric movements. By reducing the time in-between these two movements, a man can become faster and more powerful.