Helps you jump if done correctly.
What you have to do is keep your knees locked and just jump off the ground about an inch. You can't bend your knees at all. You should do it for about 1-2 minutes.
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It will work if you keep it up for 2 months and work hard at it.
If you get better put a ball in your hands and do it for a longer times.
Jumping.
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