As I continue to refine shoulder flexion, I've found dead hangs to be invaluable. Specifically, from stall bars or similar subsitute. I actually got the inspiration from Physicality GST (thanks Chris), as I have no stall bars but the set up on the left.
The key is to try to sink low enough to make your shoulders into ear muffs, and get the whole back in contact with the support, especially lower back with PPT. The Lats and chest get a tasty stretch out of this. Hang out there for a minute or so as part of your warm up for HS workouts, it really helps with those pesky flexion iMs.
Hope this helps those who are struggling with iM1 ![]()