Improve Muscular Endurance and Strength
Assume that you are not able to do 15 to 20 or even more pullups in one set. Practicing this exercise on a daily basis may significantly improve the strength of muscles on the upper body. Theoretically, this means that you would lift more weight at the same reps. You can also improve the muscular endurance as well, meaning that it is easier to do more reps at the same weight. As you tend to use the body weight only for the pullups, this results in more pullups each time. [2]
