Why is it worth training on the chest? Basically, any exercise that involves a dynamic transition from the absorption of force to its use is a plyometric exercise. So if you jump in place, you do a plyometric exercise. Speaking a bit more technically and using jumps in place as an example, landing from a jump, the thighs will be tense all the time (technically we are talking about eccentric muscle contraction), and then transfer all power down by instant muscle contraction (concentric muscle contraction). This muscle contraction pattern is known as the stretch-contraction cycle. In this way, muscles are able to generate huge amounts of strength during plyometric activities. This type of training is therefore a great way to develop speed, strength and agility.