There's a reason ballerina's have amazing legs! Sumo squats (AKA grand plies) are awesome inner-thigh toners. The addition of the slide in this move forces your muscles to work even harder.
How to do it: Stand with your feet together, knees and toes turned out about 45 degrees. Take a wide step out to the side with your right foot, and squat down as low as you can. Keep your back straight, drop your hips low, and reach your arms to the ground in front of you. As you stand up, slide your right foot into your left, squeezing your legs together until your heels touch, and reach your arms overhead. Step back out into your squat with your left foot and repeat 20 times total, switching legs each time.
Form tip: Make sure to keep your knees pointing over your toes as you lower into your squat position.