Jump training can help but its strange. I have been playing volleyball for about 12 years now I can jump about 36-40" and touch 11'4".
But the strange thing is in high school we did jump training everyday and I was barely touching the rim. Soon as I played in college I magically started jumping and that was a summer of no exercises either. Nor do I do any jump training now, just regular workout to keep in shape. Some people say it is fast twitch muscles, your either born with it or not but I dunno, just for some reason I can jump really well and I am white too! 6'4" 220.
