We already know J.J. Watt can jump really high, but even he has limits.
That limit is a 5-1 box jump. The Texans defensive star posted a picture showing him attempting the ridiculously high leap. It looks like he almost made it, lost his footing and came crashing down. Luckily, his spotter broke the fall.
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Well, the spotter probably doesn't feel lucky to have a 289-pound guy land on top of him.