The serratus chair shrug increases strength and stability in the shoulder and rotator cuff muscles.
Place your hands on bench behind you at hip level. Plant your feet in front of you and bend your knees, supporting your body in front of the bench. Press your shoulders down and you raise your upper body.
Straighten your arms completely, shrugging your shoulders up to your ears. Allow your back to relax, so your torso lowers between your shoulders. Hold and return to start.
Make sure to keep knees bent to 90 degrees and maintain your posture throughout the move.