Not done with RC/PE9 yet, but just want to play around and feel the difference between L sit chin up and L sit pull up, especially initiating from a dead hang (in L sit, not really that dead), where I'm the weakest. Below is how I feel based on my attempt, please let me know if I'm doing anything wrong.
L sit pull is def harder at the bottom than L sit chin. I have to very deliberately rotate my lats forwards (or protract the shoulders) in order to point my elbows in the right direction. If I don't do this, my elbows end up flaring out, and my shoulders will feel weird while pulling up. I could even hear my shoulders or scapulars grinding in some of the reps. I wonder if I didn't warm up properly. On the other hand, I feel I have better control of the L sit part in the pull up than the chin up. Maybe I'm just more used to extending legs out with the over grip.
I'm also playing with close grip (both the hands and the forearms are touching) L sit chin up. It's another kind of torture. But fun. I <3 pull ups. ![]()