Targets: Shoulders, arms, and obliques
Stand with feet hip-width apart, knees slightly bent, holding a 1-liter bottle of water with both hands in front of you. Slowly lift left leg, balancing on right foot. Engage abs and twist upper body to the left, back through center, then to the right. Repeat rotation for 15 reps. Lower leg; switch sides and repeat.
Originally published in Ladies' Home Journal, July 2009.