Jumping jacks

Muscles worked

You need

How to do it

1. Stand with your feet together and your arms by your sides.
2. Jump your feet out wide while swinging both arms up overhead, then jump your feet back together as the arms come back down - one smooth, continuous rhythm.
3. Land on the balls of your feet with soft knees every time, and let the arms swing through their full arc: sides to overhead and back, not half-hearted flaps at shoulder height.