Do you want to improve your jumps? Well, one thing you can do is leg raises.
This exercise can help you on the height and landing of your jumps.
Slow Kicks: Slow kicks are for strength and works your quadricept muscle. Concentrate on lifting your leg for a count of 2 up and 2 counts down. Feel your quadricept muscle working. Do 3 to 5 on each leg.
Fast Kicks: Fast kicks help your flexibility and the extension of your jumps. Also, fast kicks help you land with your feet together as you work your hamstrings to pull your leg down.
For details click Cheerleading JUMP EXERCISES.