Plank punches

Muscles worked

You need

How to do it

1. Start in a push-up position with your hands under your shoulders.
2. Punch one fist straight out in front of you at torso height - a real punch, extended fully with the arm snapping out and back - then plant the hand and punch with the other.
3. The faster the fists fly, the harder your core has to work to keep your hips level and your body from twisting: the punches are the engine, the stillness of everything else is the exercise.