Aligator Plank

Start in plank position on your elbows and back and legs straight. Bring your right knee up towards your right elbow. Turn the knee is far out as your can so that your thigh is parallel to the floor. Squeeze your obliques. Return to starting position and then do the same with the left knee. Modification: If this is too difficult, start off on your knees in modified plank. Complete the move as described above with your knees on the floor.

Make sure to keep your hips down in line with your shoulders. Be careful of the tendency to pop your butt up in the air.