To take care of your skeletal system, here are some tips:
1. Be careful to not have some bone injuries.
2. Avoid doing wrestling or boxing that can cause bone damage/s.
3. Consult a doctor if having a ache on the bone. :-)

For muscular system:
1. Dont carry heavy things.
2. Always strecth your arms and legs every time you wake or before you sleep.
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by taking care of three aspects-strength,stamina and strechability..isometric weight anti gravity exercises against force by lifting yourselves on your toes etc.also forms hormones which circulate calcium in bones ..streching makes you supple and stamina increases your ability to use them..plan your moves should have lots of protiens and calcium too..