: Bicep curls, forearm down What does doing bicep curls with forearms facing down achieve? It seems that forearms facing up (standard way most people do them) exercise the "outer" bicep, while forearms facing down exercises

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Reverse curls are done with the palm down. They primarily work the brachialis and the brachioradialis.

Hammer curls are done with the the palm facing inward. They work the biceps brachii, the brachialis, and the brachioradialis more equally than the other two positions.

The standard curl is done with the palms facing up. They primarily work the biceps brachii.

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Here's a good link to some curl variations and a pic of the muscles being worked on:http://www.bodybuilding.com/fun/drobson215.htm

In plan language (from what I understand) the palm down works more of the forearm in addition to the bicep, the hammer (neutral) a more even split of stress on forearm and bicep and the traditional curl mostly the bicep. (much like pull ups and chin ups).