The C-Curve ab exercise works your rectus and transversus abdominis, quads, inner thighs, and calves.
-Cinch-It Secret: C Curve. Place your palms on the wall at about hip height so that your upper body is parallel to the floor when you bend over. Squeeze your abs and keep your knees slightly bent as you lift your heels high off the floor. Do 20 pulses and 3 sets total.