hammer curls

By regular curls, I assume you're talking about Bicep curls. Well, as the name suggests, bicep curls isolate your biceps more. Hammer curls on the other hand, while still working the biceps, also work the brachials (forearms) quite a bit more.
 
There is no such muscle as the brachials. There is a muscle that is least superficial called the Brachialis that is under the larger two headed muscle named the Biceps Brachii. But is definatey not in the forearm. Buy an anatomy and physiology text book and start reading :D


As for the answer to your question hammer curls for strength and a longer muscle belly and normal curls for a more peaked bicep.
 
I suggest you buy the marieb text book but it says in the cover of mine. Not avaliable in canada or the usa so maybe not
 
he could have been talking about the Brachioradialis. the names are alot alike and easy to mix up. but the hammer's will hit the forearms more than a regular curl i think.
 
indeed they hit forearms more...you should really feel hammer curls in the front side of the elbow, rather than deep in the bicep like a supinated curl (palms up).

when you curl with dumbells and go from a natural palms in to a palms up grip, that attempts to incorporate both forearm and upper arm.

just be diverse in your pulling exercises for arms to get good all around improvement.
 
I would just echo what was said earlier - hammer curls help to give the "pop" to your biceps. I usually do one set of hammer curls during my arms day. If you do them like regular curls, with dumbells, but with palms facing each other, that's how you work on getting that "pop" - if you do them so that you doing curls but with your palms facing back at the start or facing down after raising the weight, you emphasize the forearms a bit.
 
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