PROPER SQUATS : Bring your toes to the wall, almost touching, then sit down. Stay looking straight so you learn to keep your torso up. Sit as low as you can go then hold the seated position for seconds and repeat. Great for butt, legs, and core.
The Anatomy of a Perfect Squat - It is very important to keep your knees above or behind your toes. Don't let your knees go past your toes as this is very hard on your knees, and you won't be exercising the muscles that you want to accurately.