A doorway pull-up bar is a fitness device designed to be installed in a doorway, allowing users to perform pull-ups and chin-ups at home. It typically consists of a sturdy metal bar that can be mounted securely in the door frame, providing a convenient way to strengthen the upper body, particularly the back, arms, and shoulders. These bars are adjustable to fit various door widths and often feature rubber grips for comfort and stability. They are easy to install and remove, making them a popular choice for those who want to incorporate strength training into their routine without needing a full gym setup.