Lay down with your back pressed against the floor

Your arms should be fully extended to the sides with your palms facing down

With a slight bend at the knees, lift your legs up so that your heels are about 6 inches off the ground

This is the starting position

Now lift your left leg up to about a 45 degree angle while your right leg is lowered until the heel is about 2-3 inches from the ground

Switch movements by raising your right leg up and lowering your left leg