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Stand with one arm relaxed at your side and one arm straight out to the side and parallel to the floor. Have your partner stand on the same side as your extended arm and apply resistance against the back of your arm to push it back in towards the body. Resist as your partner pushes your arm back across your body until it is straight out in front of you and perpendicular to your torso. Continue pulling back against the resistance until your arm is back to the starting position straight out to the side. Do 10-15 reps and repeat with the opposite shoulder.
Tip: Make sure your partner isn't putting any pressure directly on your elbow joint.
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