What does this pull up variation work?

[TheAnonymous]

The one where your palms are facing each other and NOT toward you, does that work your forearm because I can feel it there sometimes. I never feel it in my forearms with the regular chin up.

[RobCosimo]

Any exercise that involves grip works your forearms. I'm sure there's slight differences how they're worked, but not enough to worry about in my opinion.

[holvoetn]

My feeling as well.
Just do those pull-ups

[JorickDD]

When palms are facing eachother, youre forearms are indeed more involved. The brachioradialis to be exact. The biceps brachii can do less work because the tendon is twisted around another bone in the forearm when palms facing eachother, so the brachioradialis takes over - hard to explain this in english . Comparable to a hammer curl