its jump training and hopp exercises, its for any type of exercise programs, u can probably get 5 or 6 inches of vert from ur calves but it would take a while. if he follows this program concistently for a while he will get probably 1 or 2 inches and e able to run a bit faster. it will probably increase his first step speed too.

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Age:14 Height: 5' 9" Running Vertical Jump: about 32 inches
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