Jumping rope vastly improves the cardiovascular and respiratory systems.
It greatly improves coordination, reflexes, and stamina; increases vertical jumping ability; strengthens the shoulders, forearms, wrists, and grip.
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Oh yea, the calves and balls of the feet. If you are a seasoned runner and think you have well developed calves and the balls of your feet are tough and have never tried jumping rope before, try it for a while.