Bodyweight plank up down

Muscles worked

You need

How to do it

1. Start in a push-up position with your hands under your shoulders.
2. Lower onto one forearm, then the other, so you're in a forearm plank, then press back up one hand at a time to straight arms.
3. Alternate which arm leads on every rep.
4. Your hips will lobby hard to sway with each transition - the exercise is keeping them level and quiet while your arms rebuild the plank underneath you, over and over.