One-arm plank hold

Muscles worked

You need

How to do it

1. Start in a plank position with your hands under your shoulders and your body in a straight line from head to heels.
2. Widen your feet for a broader base, then lift one hand off the floor and tuck that arm behind your back - and hold.
3. The moment the hand leaves the floor, everything changes: your supporting shoulder takes double the load and your abs and obliques go to war against the rotation trying to twist you toward the floor.
4. Keep your hips square and level, complete the hold, then switch arms.