the key to increasing your vertical is to have some sort of a program or scedule. You can't just do one of the exercises one day and expect to see a huge increase. Over time you will gain. By the way, i must reccommend THe vertical leap program Rise to the Rim. it works better, faster, and is cheaper than anything that i have used so far. to check it out go here: http://www.homestead.com/risetotherim
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I followed everything on this site to jump higher but still not high enough, can anyone give me advise to jump higher without buying anything?