Strengthen your back and abs—all while keeping your lower body engaged—with this toning move.
How to do it: Sit tall with knees bent and together (focus on squeezing inner thighs together for more muscular activation), toes pointed, hands behind head. Brace abs in tight and hinge back until just shoulder blades are lightly touching the back of the chair. Bring body forward, crossing right elbow to the outside of left knee. Return to start. Repeat for 20 alternating reps.
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Don't be fooled: This workout firms and burns much more than you'd think!