Jump rope is excellent for coordination and agility which is essential for your jumping technique. Ankle Weights are not good man. Seriously just try this. Walk around on your heels until you start feeling a burn in your shins/ankle region. Another good way to build up ankle and toe strength is toe crunches and extensions.

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Stay Motivated, Stay dedicated. Anything is possible with Work Ethic, You see it, You do it, You live it. Ball and Jumping is a way of life in which you excel once all effort is put forth.