Muscles matter: Work your arm muscles with these exercises
Biceps
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This muscle is located in the front of the upper arm and is responsible for flexing the elbow and helping rotate the forearms so that the palms face upward.
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Triceps
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Located at the back of the upper arm, the tricep is responsible for extending the elbow.It is larger than the biceps and makes up a significant portion of the upper arm.
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Deltoid
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The deltoid muscle is a large triangular-shaped muscle that gives the shoulder its rounded contour.
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Pecs
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Pecs, or the pectoralis major, is a large, fan-shaped muscle located in the chest and helps in pulling your arm across the front of your body.
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Lats
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The lats, or latissimus dorsi, is the largest muscle on the back and is responsible for rotation, extension, and adduction of the arm.