HOW: Anchor TRX bands above your head. Face away from the anchor and place a band in each hand. Walk your feet back as you lean forward. Keep your elbows straight, knees straight, and have your toes pushing into the ground creating a plank position. The further your feet are behind you the harder the plank will be. Hold this position for as long as prescribed.
FEEL: You should feel your core muscles working.
COMPENSATION: Keep your back flat, knees and elbows straight.