Achieving a muscle-up requires training of forearms, brachialis, and hands, and the ability to generate sufficient force at the beginning of the movement.

“Um, a lot of there's some training of forearms and brachiialis and hands that's required. But he said, you know, that not being able to generate enough force at the beginning is is a reason a lot of people don't get to the the muscle up because uh with the muscle up, you actually there's a little bit of a kip involved, at least when one's first learning it.”