What is the prime mover used in a pull up exercise

latissimus dorsi

Explanation:

our latissimus dorsi is the most powerful pulling muscle in your back, and during a pull-up, it's the primary mover, or the muscle that provides most of the power to bring your body up to the bar. One of the movements it performs is shoulder adduction, or bringing your arms down toward the sides of your body

yes you do or he will not stop with that

they cheat and apolgize adn they do it again