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The triceps extension is an exercise you can do with a dumbbell to strengthen the triceps muscle in the back of your upper arm.
Lie on your back with a dumbbell in your hand. Point your upper arm toward the ceiling, with your elbow bent to 90 degrees. Slowly straighten your elbow, moving the weight upward. Avoid using momentum to force your elbow straight. You'll feel tension in the muscles in the back of your upper arm. Then slowly lower the weight to the starting position. Repeat. If necessary, use the opposite hand to help keep your arm in a 90-degree position during each extension.
You can do triceps extensions lying on a weight bench or on the floor.
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