I'm mostly a tennis player, but this summer I plan to increase my vertical jump because I'm technically more of a volleyball player. I just turned 14, and I know I shouldn't be doing weights, any jumping programs etc because they are not good for me and stunt my growth. I'm 5"6, 115 pounds, and I have a vertical of 30.5", which I believe is good for my age. I would just like to share my program I plan to do this summer and any revisions I need to make. Step 1: Light run, around 500m to warm up the muscles. Step 2: Stretch the calfs, hamstrings, quads, etc. Step 3: Jump rope for 10 minutes. Step 4: Sit ups 20 x 2 and Pushups 20 x 2 Step 5: Stationary Bike 15 minutes. (6 km) Step 6: Calf raises (50 each leg) Step 7: Sit ups 20 x 2 and Pushups 20 x 2 Step 8: Jump tucks 10 x 2 and Jump taps 20 x 2 Step 8: Sprint 600m all out Step 9: Run lightly and stretch. Thanks!