Here's exactly what you're working when you hit the bar to do one of the most comprehensive upper body exercises ...

Sure, flashy high-skill movements like muscle-ups, planches and levers look cool, but the real king of bodyweight movements is the pull-up. It's a portable muscle-builder that you can perform anywhere ...

Pull-ups are notoriously hard to crack – in part, because they require a high level of full-body strength that takes most ...