Plank – On Knees
- HOW: Assume the modified plank position on your elbows and knees. Simply hold this position for the desired amount of time. There should be a straight line from your knees to your head.
- FEEL: You should feel all the muscles in your stomach working to hold this position. You may also feel your butt, shoulder, chest muscles working.
- COMPENSATION: Do not arch your back or let your butt sag to the ground