Mainly to practice biceps brachii.

Pull-ups:

Exercise the back and increase the width of the back. Latissimus dorsi is one of the key training parts for bodybuilders. Pull-ups can stretch the spine, make the spine stretch as much as possible, and promote the proliferation of spine bones.

Teres major, teres minor, infraspinatus, trapezius, biceps brachii and latissimus dorsi can develop through positive grip pull-ups with different grip distances, but the emphasis is different.

Wide grip pull-ups stimulate the middle and upper parts of latissimus dorsi;

The middle grip pull-ups focus on stimulating trapezius muscle;

Narrow grip pull-ups focus on stimulating upper latissimus dorsi and teres major.

Hold the neck and pull up, and stimulate the upper and middle latissimus dorsi, teres major, teres minor, rhomboid and deep back muscles.