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Unless your curls have a lot of front delt involvement (poor form) I don't see how they would be hindering Incline bench press. But I could be wrong.
ACTUALLY, and this is something I only recently learned, the fully range of motion of the biceps does involve raising the forearm. One only has to look at the physical attachment locations.
As you can see, one of the bicep heads attaches to the collar bone, therefore a fuller range of motion does in fact involve raising the forearm - but to how much of a degree for it to receive the proper full contraction I'm not sure. I've started explicitly adding a raise of the forearm as part of a finisher on the last set in the few cases I do curls.