We try to avoid cliches, but in this case, there's no way around them. These are faces only a mother could love.

Plyometrics (jump training) is a great tool for improving an athlete’s speed, power, explosiveness, elasticity, eccentric strength, and other aspects of the neuromuscular system such as rhythm, balance, proprioception, movement coordination, and agility.

The title says it all, which is a quote from Tom Myslinski, currently the Head Strength and Conditioning Coach at Robert Morris University in Pennsylvania. Every youth sports related newspaper or magazine article you read these days has children as young as 7-8 years-old playing organized year-round sports.