Hi!

When I do
L-Pull ups, I feel like I´m getting blocked in the back of my shoulders,
initiating the movement from fully extended arms. I have trouble lowering into
a full dead hang as well. This is only a problem when I flex the hip and put my
feet out in front as in the L-Pull up. I never have this problem doing regular
pull ups and I figure it´s not strength related as I can do weighted pull
ups  with a descent amount of weight.

My shoulder
mobility is generally pretty good, except I might be missing some internal
rotation and have been told my posterior capsule might be a bit tight. I also
have a fairly stiff thoracic spine.

So I´m wondering
if anyone know of specific stretches or mobility drills that might be helpful?

Thanks in
advance