Lie face down on the floor with your head resting gently on the backs of your hands. Pull your abs in toward your spine and raise your legs 3 inches off the floor (keep them straight no bending at the knee). Rotate your hips so that your toes turn out, and quickly open and close your legs 6 to 8 inches, keeping them straight. Vigorously beat your heels together for two sets of 30 repetitions.