The setup: Stand with your feet slightly apart and your knees slightly bent. Hold a dumbbell in each hand using an underhand grip, your arms at your sides, palms facing inward.
The move: Contract your abdominals. Curl the dumbbells up to your shoulders while twisting your palms so that they are facing you at the top of the move. Pause for a second, then gradually lower the dumbbells to the starting position. Control your movements throughout the entire exercise, exhaling while lifting the dumbbells up and inhaling on the return. Continue until the entire set of 8 to 10 repetitions is complete. If you are performing multiple sets of this exercise, take a deep breath, wait 15 to 30 seconds, and begin your next set.
Tip: Maintain your posture throughout the entire exercise and do not allow the dumbbells to "fall" back down.