Lifting your entire body's weight using just your arms is incredible. The muscles most used in a single pull-up are: lats, rhomboids, traps, shoulders, posterior deltoids, and brachialis. Depending on the number you do and the rate you do them at you also get to activate your cardiovascular system and your lungs. All this, in turn, transforms what appears to be a simple exercise into a powerhouse that drives many muscular and vascular adaptations in the body, which in turn helps us maintain our physical and mental health.