Corgel said these work your deep core muscles and obliques. Another name for them is the Russian twist.
- Holding a dumbbell with both hands, sit with your knees bent and your heels off the ground in a bent-knee Boat Pose.
- Keeping your belly button pulled into your spine, rotate your entire torso, along with the dumbbell, to your left side. Return to center, and rotate to the right. This counts as one rep.
- Try to keep your lower body as still as possible throughout.
