What is the position of the palms during a chin-up?

During a chin-up, the palms face towards the body. This position is fundamental because it indicates a supine grip, which is different from other pulling exercises where palms might face away (as in a pull-up) or have different orientations.

The supinated grip used in chin-ups emphasizes the biceps brachii, allowing for greater engagement of these muscles compared to other grips. This grip orientation also engages various muscles in the back, such as the latissimus dorsi and rhomboids, while providing a different biomechanical advantage in the movement, leading to a more effective exercise for building upper body strength. Additionally, the positioning of the palms towards the body contributes to better control and stability during the pulling motion, making the chin-up a popular choice for developing overall upper body strength.