Freeman believes that this move is one of the best ab exercises around. Yes, your arms are the primary movers, but she says that your abs will do most of the work.
Use a towel or gliders, but this time, under your knees, start in a modified push-up position with your hands and knees on the floor and butt in line with your spine.
Using your triceps, slowly push your knees back away from your hands to a slow four count. Then, slowly bring your knees back to the starting position.