In this variation, the abs work extra to maintain stability as you pull the dumbbell away from your center.
- Begin sitting with your heels planted about two feet from your butt, holding the weights at chest level with a slight bend in your elbows. Lean back a few inches, pulling your abs toward your spine to keep your spine long and straight.
- The left arm remains still, as you open your right arm to the side, making sure the weight doesn't go beyond your shoulder.
- Bring your right arm back to center to complete one rep.
- Complete 10 reps with the right arm, then switch sides for another 10 reps to complete a set. Do three sets total.