How can you do high cheerleading jumps?

Question: How can you do high cheerleading jumps!?

i can do jumps pretty good i just need to get them higher!. any good techniques, stretches, exercises, etc!.!?
tryouts are tonightWww@QuestionHome@Com

Best Answer - Chosen by Asker:

keep your back straight

do conditioning for your calves [idk how to spell]
so you can put more force to the floor and you'll go higherWww@QuestionHome@Com

I'm a dancer, not a cheerleader so some of these terms may be unfamiliar but be sure to use a good plie (bend your legs) before you jump!. It'll give you more force and you should go higher!.Www@QuestionHome@Com