What things can you do at home to improve your high jump?

I was one of the only girls who qualified in for high jump, so I get to do a special program. I am just wondering what I can do at home, and can jumping on the tramp improve my jumping skills?|||If you live near a beach, jogging, stride running and long jumping in the sand. Jogging in the sand will build up your calf muscles and striding and long jumping will help with your high jump take offs.|||Well I guess any sort of jumping would build your muscles if you work hard enough. But the best thing is to do Box Jumps, Squats, or any workout with eplosion involved.