I have a lot of strength/power when doing shrugs likely from years of deadlifting and past weight training.
What I have come to realize is that my shoulder decompression is weak. I can briefly hold an L-sit on an elevated surface, but with my hands on the ground I can't lift myself up.
I am going to assume, I don't have the shoulder decompression strength to force my scapula and shoulders down so my hands can reach below my butt under weight.
Do you guys have any suggestions on exercises that help with shoulder compression?