A chin-up bar is a piece of exercise equipment designed for upper body workouts. It is typically mounted on a wall or door frame and allows users to perform chin-ups and pull-ups, which strengthen the back, biceps, and shoulders. The bar is usually made of sturdy metal and can support a significant amount of weight. Chin-up bars come in various styles, including doorway models and free-standing versions. Some may have additional features like grips for different hand positions or attachments for resistance bands. They are popular for home gyms due to their compact size and effectiveness in building upper body strength.