2, you can't just pull your chin, you should pull it up to your chest.

3. Wide grip pull-ups can train the upper part of latissimus dorsi.

4. Biceps biceps brachii can be practiced by reverse grip pull-ups, and the narrow grip distance can strongly stimulate the biceps brachii of the arm.

Extended data:

Pull-ups are movements that suspend and pull one's body weight, which can pull and loosen the lumbar vertebrae, correct and delay the progress of adolescent scoliosis, and are also beneficial to lumbar disc herniation and lumbar muscle strain in middle-aged and elderly people.

Pull-ups are also a relatively safe project, which is not easy to cause acute injury. Some bodybuilders tie heavy objects around their waist to do pull-ups, which is easy to cause abdominal and muscle strain of latissimus dorsi, biceps brachii and trapezius. Patients with scapulohumeral periarthritis do not advocate pull-ups, so as not to cause strain of shoulder tendons and rotator cuff.

People's Network-How do experts practice pull-ups