The mountain climber is a more explosive move. It’s like a plank, but in motion. Start in high plank, with your palms flat on the floor, hands shoulder-width apart, shoulders stacked above your wrists, legs extended, and core engaged. Start in high plank, with your palms flat on the floor, hands shoulder-width apart, shoulders stacked above your wrists, legs extended, and core engaged. Return your left leg to the starting position. That's 1 rep. Continue to alternate. The quicker you move your legs, the more of a cardio challenge this will become. Make sure to keep your core engaged and back flat throughout. If you have to slow down to maintain form, that's fine.
by Deesha Bondre