HOW: Begin by standing at a cable machine or resistance band set, facing away. Set the stack at about hip height. Taking the handles to shoulder height, find a forward push of the shoulder blades while punching your arms in front of you. Begin to slowly raise the arms overhead at a 45 degree angle from vertical. Once the elbows are in the plane of the ears, the motion is complete. Slowly return the arms in front of the body.
FEEL: You should feel the inner bottom shoulder blades working at the lower trapezius.
COMPENSATION: Avoid shrugging the shoulders. Avoid letting the arms come straight up overhead.