No. 1: Improve Your Posture Slouch and your stomach pooches. So straighten up, and you've done your abs a favor without breaking a sweat! No. 2: Think Whole-Body Exercise Don't get so into your abs that you overlook your other muscles. Your core muscles also include your glutes and back muscles, for instance. Pilates is one way to work all of the core muscles, plus the arms and legs, for a whole-body workout that does strengthens the abs - No. 3: Try the Canoe Twist Stand upright, feet apart. Interlace your fingers to create a solid grip. Exhale, and sweep the interlocked hands, arms, shoulders, and chest to the left, as if "rowing a canoe." Simultaneously lift the left knee up and to the right. Inhale and return to the starting position. Exhale and perform the movement to the right. Alternate for 20 repetitions. 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. No. 5: Practice the Pilates Zip Up Stand upright with heels together, toes slightly turned out. Bring your arms up, hands joined underneath the chin. Exhale, press your arms down, keeping hands and arms very close to the body. Simultaneously, lift your heels off the ground onto your tiptoes. Hold for two seconds at the "top," inhale and return to the starting position.