Three reasons to do ... russian twists

The move: Russian twists

Three reasons to do it now

• They're efficient: Twists target all three regions of the abs: The rectus abdominis, transverse abdominis and the oft-neglected obliques.

• They'll help you hit a home run (or an Ace or a birdie): "The move trains the entire body to work as a unit, ensuring a smooth transfer of forces between the upper and lower body," said Tom Holland, author of "Beat the Gym." "This results in increased power and a more efficient swing for golf, tennis, squash and baseball players."

• They'll ward off injury: We become more susceptible to injury when there's an imbalance between complementary muscle groups like our abs and our back. "Russian twists, however, work the abdominal muscles as well as the muscles of the lower back simultaneously, which keeps the two regions in balance so one isn't overworking to compensate for weakness in the other," Holland said.