There's more to a biceps curl than just the flex. Keep this posture note in mind to get the most out of your reps.

Second, the mirror muscles will eventually stop growing. The body is smart. It's so smart, in fact, that it will actually prevent a muscle from developing if the antagonist is too weak. Even if your ...

Fitness coach and ATHLEAN-X founder Jeff Cavaliere broke down his science-based guide for transforming triceps development.