The doorway pull-up bar is a classic piece of at-home exercise equipment. It checks all the boxes: Cheap. Detachable. Easy to stash in the closet when you realize exercise really, really sucks. But despite its convenience, the doorway pull-up bar does have one foible: It can demolish your doorway, especially if you weigh more than a penny. The good news is, there are a couple simple ways to prevent doorway damage, and doorway pull-up bar alternatives for you extra heavy kings. Here are some things to keep in mind from my pals at MEL Magazine.