The upper-body exercise where you hang from a bar and pull yourself up using an overhand grip is a pull-up.
A pull-up is a closed-chain strength exercise: the hands stay fixed on the bar while the body moves upward. The overhand, or pronated, grip distinguishes it from a chin-up, which normally uses an underhand, or supinated, grip. The movement relies heavily on the latissimus dorsi, while the biceps, trapezius, and other upper-back muscles assist.
Pull-ups are often confused with lat pulldowns because both train similar pulling muscles. A lat pulldown is performed on a machine while seated, whereas a pull-up requires the person to lift their own body weight. Rows are another related exercise, but they involve pulling horizontally rather than lifting the body vertically.
The exercise can be performed with different grips, including neutral and mixed grips, and with equipment such as bars, rings, or towels. Pull-ups are also used in military, police, school, and athletic fitness tests because they measure practical upper-body pulling strength.