It’s a common debate among gym-goers. Which is better for your body: the pull-up or the chin-up? And if you were to ask five different people, you’d likely get five different answers. Which is probably why a study in the Journal of Strength and Conditioning Research took a scientific approach and measured muscle signals during both exercises.

What they found was that while similar, the chin-up more heavily worked the chest and upper arms, while the pull-up focused on your back’s lats and traps. So really, it’s less about one being better or worse. They simply provide different benefits. But for a balanced and strong upper body, you want to add both of these to your workout routine. After all, in a GQ magazine survey of what muscles women find the sexiest, the answers focused heavily on the arms, shoulders and back.

They’re humble exercises, but that doesn’t mean they’re easy. Both the chin-up and the pull-up are complex body-weight moves that offer a broader range of motion and bigger returns than something you’d get from a standard bicep curl or working a weight machine.

It’s common for people to struggle with both moves—especially when starting out. Pull-ups (done with both hands in an overhand grip slightly wider than shoulder-width apart), prove to be the most difficult. The wide grip isolates your lats, taking away much of the emphasis from the biceps. Chin-ups (the underhand alternative), tend to come faster because you’re using your arm muscles that are pretty strong already. Both are exercises you want to perform early in your workout so you have the energy and strength to give them the energy and form needed to do them properly.