To strengthen your legs which will eventually help you to jump higher, you could do squats to strengthen your quads which help you to jump higher or stand on a step or a raised surface with your heels hanging off the edge and slowly go up onto your tip toes i would suggest 30-50 reps a day xxxxx

Try jumping up and down junior nothing beats practice.

Purchase a trampoline...

Just follow this video

http://www.youtube.com/watch?v=VEAi-Zu0N...

I'm 6"4 and 5 months ago I got surgery in my knee. I have to start all over again and I want to know if there are any exercises that I could do to be able to Jump Higher (Dunk)