Really hard stress ball for your hands? Grip and ungrip anything that gives resistence. We've got this hand thing at home. It's got a tightly wound srping with handles attached to each end, so you hold it in one hand and pull the handles together, which works against the spring. Ok, so it's really hard to explain...
Run for you legs.
Laugh for your stomach. Seriously, it works your ab muscles.
At your age you shouldn't be doing weights because your bones are still growing and if you do it on regular occasions, your bones can bend. My friend's older brother wanted to go to the gym and do weights when he was about...16 I think but his ym teacher told him not to for that reason.
Yoga? That REALLy works on the muscles and the flexibility too. Great for relaxation too, I hear.
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