The ONE Fitness Commandos begin in a high plank position. Lower yourself ONE arm at a time to a low plank. First to your left forearm then your right. Push up off the floor with the opposing arm to straighten both arms returning you to the high plank. Reverse this movement sequence and repeat until the set is complete. 

Tip: Try to eliminate the wiggle in the hips by firing up your core, maintain a flat back during the exercise, and a straight line up & down your spine.