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Make a fist with your thumb outside your fingers.
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Straighten your fingers while keeping your thumb close to the side of your hand.
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Keeping your fingers straight, bend your wrist backward toward your forearm.
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Keeping your fingers and wrist in position, extend your thumb.
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Keeping your fingers, wrist, and thumb extended, turn your forearm palm up.
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Keeping your fingers, wrist, and thumb extended, use your other hand to gently stretch your thumb.
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Repeat 10 times.