Plank jump-ins

Muscles worked

You need

How to do it

1. Start in a push-up position, hands under your shoulders.
2. Jump both feet forward together, landing in a crouch with your knees tucked up toward your chest and your hands still planted - then jump both feet straight back out to the plank.
3. In, out, in, out: your abs pull the knees in, your hands never move, and your hips stay low on the way back so you land in a plank, not a pike.