Sports knowledge: the body of the three major energy systems

Plyometric Training (PT) is also called stretch retraction training!

Is a pre-stretching (pre-stretching) and then contraction of the action, so that muscle elasticity can be fully stored and released to produce fast and powerful contraction of the nerve muscle training. Enhanced training can enhance the movement effect, stable movement action, but also a development of explosive exercise method.

This is to let the muscles produce the principle of shortening the cycle of action, in fact, the body receptor "muscle spindle" (muscle spindle) in the role. When the muscles are forced to stretch quickly, "muscle shuttle" will be in order to protect the muscles, causing reflex contraction.

Any movement of the action, the first use of the main role of muscle for centrifugal contraction, and then instantaneous centripetal contraction action, that is, enhanced training. When we are ready to take off, the body will first squat, then the main role of muscle (hip, knee, ankle large muscle group) to produce elastic energy, with the subsequent take-off, this energy will be converted into kinetic energy Energy balance principle); muscle constantly repeated stretching - shorten the process.