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Stand with one arm relaxed at your side and one arm straight out in front of you and parallel to the floor. Your partner will be on the side of the extended arm and holding the inside of your forearm to apply the resistance. Contract your chest muscles to resist as your partner pulls your arm away from your body until your arm is completely out to the side. Keep resisting as you bring your arm straight out in front of you again. Do 10-15 reps and repeat with the opposite shoulder.
Tip: Keep your hips square to the front; don't let your body twist towards your partner.
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