Get down on your hands and knees, with your wrists directly under your shoulders. Draw your abdominals up and in. Inhale, then exhale as you slowly extend your right leg straight back [shown].
Hold for 2 counts as you do a Kegel. Keep your body still as you bring your right leg back to the starting position. Switch legs and repeat. Do 10 times on each side, working up to 3 sets of 10.
Benefit: Tones the transverse abdominis, the deepest abdominal muscle.