Learn the training techniques of the man with the fastest hands and feet in town. Will Holder, of Sports Intelligence Training via Key2 Sports Training in Wall, NJ... Former NFL/AFL/NCAA football player shows youtubers a little bit about what it takes to improve footwork, core mobility, and hand speed all wrapped in one brief 2min45sec vid. Watch Will Holder work some basic ladder drills at blazing speeds, (Even some drills you may have never seen before!) that any athlete would find useful. Then he'll take you aspiring DB's through a few 'quick jam' drills that will help improve your game at defensive back in man to man coverage.
The presenter clearly states what to do to increase your vertical leap if you are not genetically blessed.
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Vertical Leap Blog
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Income for Life
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Jahvid Best jumps over the OSU defender into the endzone and loses his balance in mid-air and lands on his head/back. He had a bad concussion and did something to his shoulder. He is in my prayers and I hope that he is in your's too!!