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I have used the special mat with cord that is attached to a belt you put on. Now there are all sorts of fancy contact mats, computing the height of the jump from your hang-time.
The DIY version is pulling a cord attached to your waist through a fixed loop. Measure the difference between before and after the jump.
Good luck,
I have used the special mat with cord that is attached to a belt you put on. Now there are all sorts of fancy contact mats, computing the height of the jump from your hang-time.
The DIY version is pulling a cord attached to your waist through a fixed loop. Measure the difference between before and after the jump.
Good luck,
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