This exercise works the legs and glutes, but as you slide your leg back to centre, your inner thigh does all the work. You need one of those discs like the Valslide, but if you don't have one, just use the lid of a plastic container and do this move on a carpet. Or wear socks and try it on a wood floor. Stand with your feet a few inches apart, with your right foot on the plastic lid. Make a fist with one hand and cup your other hand over it. Keep your hands in front of your chest throughout the exercise to help you stay balanced. Put weight into your left leg, and as you slowly bend your left knee and squat down, slide your right foot out to the side. Then as you slowly straighten your leg, slide the right foot back in. Most of your weight remains in the leg that's not moving.
