Everything You've Ever Wanted to Know About michael jordan vertical
http://wiki.soippo.edu.ua/index.php?title=%D0%9A%D0%BE%D1%80%D0%B8%D1%81%D1%82%D1%83%D0%B2%D0%B0%D1%87:Margarfi0e
Vert Shock is no magic pill. It's not a program you can take lightly, and it's certainly not one of those "Get 50-inch vertical jump doing nothing but sitting on your butt" programs-- so do not expect it to work