Stand in front of a chair with your feet about hip width apart. Slowly lower yourself down as if you were going to sit in the chair and extend your arms out in front of you for balance. The object is to keep your weight on your feet and not transfer it to your seat.
Stand up again as soon as you feel the chair. Start with 10 in a row and work up to 15. Take a break and repeat. Be sure to keep your knees over your ankles with your weight on your heels and keep your knees from caving in toward one another.