BELLY BLASTER: The vacuum
Lie flat on your back with your knees bent and feet flat on the floor. Take a deep breath that noticeably extends your belly. Exhale all the air out and pull your belly button in toward your spine―as if your stomach and lower back could meet. Tighten your abdominal muscles. Hold for 2 seconds, then relax your abdominal muscles and breathe normally. Repeat 10 times.