Have u read manual jump from jacob hiller , he was trained high school, college, NBA, Olympic athletes, and professional dunkers. He has been developing vertical jump explosion techniques for over 10 years and training coaches and athletes to maximize their potential. He has consistently helped athletes to gain 40+ verticals.
Today u must understanding and using plyometrics and u can see video at below :
and this official web site Jacob Hiller u can click
HERE