upper body can add up to 5 percent to your vertical jump.

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your upper body especially arm swing can add inches to yo vert. Thats why medicine ball drills are good.

upperbody adds way more than just 5%. you can say that about calves, but try jumping not using your arms, it's a lot lower.

yeah and the best jumpers can get off the ground just by swinging their arms, Also something most of you guys probably didn't know if you want to gain a lot of leg muscle you also have to gain upper body muscle, your body just doesn't support that type of unbalanced gains.