Sit in a firm, armless chair with your feet flat on the floor and your arms crossed or loose at your sides, whichever feels more balanced. Slowly stand up, using deliberate, controlled movements, until you reach your full height. Hold for a few seconds, and then slowly sit down again. Repeat this exercise for about 1 minute. A firm cushion can be placed on the chair if this move is difficult at first. Tip: Check your knees -- when going up or down, they should never move forward beyond your toes.