No. 4: Do the Cat Kick

Stand with feet together, arms extended like airplane wings. Exhale, and lift the right leg forward and up. At the same time, sweep the arms forward at shoulder level and round your spine, like a cat. The navel should feel as though it's pressing toward the spine. Inhale, and open back up and return to the starting position. Repeat with the left leg, alternating for 20 repetitions.