Question: what muscles are used pull ups?
Answer: Latissimus dorsi. The “lats” are the largest muscle of the upper back, and they run from the mid back up to under the armpit and shoulder blade. ... 
Trapezius. ... 
Thoracic erector spinae. ... 
Rhomboids. ... 
Infraspinatus. ... 
Teres minor. ... 
External oblique.