Okay so it's about my friend again, he doesn't understand English so that's why I'm asking :) ..
Whenever he's doing pull ups, he says that he doesn't feel it in the lats. My idea is that his muscles are getting used to the exercise, or he might not be doing full ROM (all the way up, all the way down), or lastly he isn't retracting his shoulder blades.. I don't have any other ideas of what could cause it. If anyone could answer, thanks! :)