I'm so doubting this. If this actually works, why wouldn't every NBA player know about this and just keep on increasing their vert? 4 inches is a huge amount, that can take weeks (usually months) to increase it by. Their is a limit to how high anyone can jump. I don't even want to try this because the way this is put together, if I did this and gained 2 inches I would be disappointed because I didn't hit that second mark. If more people try this and it works then I'll give it a go, but for now, I'm just not sure. However, I do not doubt the powers of the mind. Seriously.

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Gutaj majmunova muda!
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-Youngtricker