I don't know. Because I walk right on my anything I see that I could pull myself up on.

But seriously, I own one of those contraptions that hangs above a doorway and can be used for a pull-up-like exercise. However, the hands can’t be placed as one would for a proper chin-up or pull-up. This post prompted me to retrieve it from the closet. Although I couldn’t pull myself all the way up, I remember being able to do a few when I placed it on the shelf years ago. I do have a shoulder that I broke about 15 years ago and arthritis in the other shoulder, but these weren’t the reasons for my failure. I simply lacked the arm strength to complete the exercise.