Weight lifting.

[jessesmit]

thanks guys now on to skipping ropes.. i got a good one.. But i suck at it rofl! I know it needs time but it sucks haha xD!

[Pinoy_Texan]

I agree with this......

Your bones are still developing....If you lift heavy now your tendons become less pliable and more rigid...having rigid tendons will restrict bone growth during your adolescense....you will stunt oyur growth....

High reps low weight & body weight plyometrics....

I second that motion on the plyos. It works a lot on your lower body. Also, trains/develop fast twitch muscles. Great for speed and power.