Plank hold

Muscles worked

You need

How to do it

1. Start on all fours, then plant your hands under your shoulders and step both feet back until your body forms a straight line from your head to your heels.
2. That line is the entire exercise: hips neither sagging toward the floor nor lifting toward the ceiling, shoulders pressed away from your ears, eyes down at the floor.
3. Everything from your shoulders to your calves engages quietly to keep you there, and every second you hold it, the quiet gets louder.