A plank is an isometric exercise that involves getting into a push-up position, and then staying ... No doubt, the standard, straight-arm high plank is a great exercise. “It really challenges ...

Commando Plank: Assume a low plank position. Push up on your left side so your arm is straight, and then follow with your right arm so you’re in a high plank. Come down onto your left forearm ...

Even those who follow their instructor’s guidance on where to place their hands (shoulder width apart for a plank, and just slightly wider for a push-up ... your chest and arm muscles a helping ...