Young woman flexing muscles in the gym

How to Work Your Biceps & Not Your Forearms

Many exercises believed to isolate the biceps, or the biceps brachii, build up the muscles in forearms as well. However, a few variations of the traditional biceps curl isolate the bicep muscle. When working out the biceps, you must lift enough weight to cause fatigue after 12 repetitions, according to the Mayo Clinic.

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