Answerwell jumping and playing
Basketball help. also its how you attack the ball each time you go up for a hit. even if you know you are not getting set its still good to jump with correct form . also remember to throw your arms back and then throwing them up as you jump upwards. this will help carry some weight up as you go up .
Doing plyometrics and leg work-outs will help. Try a workout that incorporates exercises such as lunges, wall-sits, squats, calf raises (can be done on stairs, I've found these most effective), etc. Even praticing/working on your approach can be beneficial.