The “plank” exercise is a great way to build strength in both the abs and back.
1. Lie face down on mat in push up position, palms flat on the floor.
2. Keep your back flat, in a straight line from head to heels.
4. Tilt your pelvis and contract your abdominals to prevent your rear end from sticking up in the air.
5. Hold for 60 seconds, lower and repeat for 3-5 reps.