Climbers

Muscles worked

You need

How to do it

1. Start in a push-up position with your hands under your shoulders and your body in a straight line.
2. Drive one knee in toward your chest, then switch legs in the air, extending it back as the other knee comes in - and keep switching in a fast running rhythm.
3. Your hands stay planted, your hips stay low and level, and your core stays braced while your legs do the sprinting.