Begin standing with your legs wider than shoulder width apart, toes turned out, and your arms straight out in front of you. Squat down and keep your knees in line with your toes, squeeze your abs tight, and keep your back straight. Stay in squat position and pulse up and down, raising and lowering your butt six inches or so each time. Pulse 10 times before relaxing and standing. The trick is to stay in squat position until the end; don't stand up until you're finished. Repeat 15 times and do three sets of these.