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"Few people are really capable of doing a perfect Pull Up using complete Lat recruitment.
Most will pull towards the bar, only reaching over it with their chins.
Some will be able to touch their chest to the bar, but will do so with rounded shoulders at the top relying on their subscapularis a habit that will eventually lead to shoulder issues.
Many do not fully depress shoulder blades nor do they retract it before pulling up a habit that will lead to injury.
Beginners, most females and generally weak people should concentrate on lat activation work first or will forever rely on their upper arms, Teres Major and Subscap for the Pull Ups and will neglect their Lat development.
Aiming to develop your pulling work towards the Perfect Pull Up will make you develop a more balanced shoulder girdle, prevent injuries and become more resilient and strong. Don't hesitate put some effort in this direction. Or else." Ido Portal

He says it all! Work on your perfect pull up champions! =)