Arch Hang

Step 1. https://www.youtube.com/watch?v=C995b3KLXS4&t=7s

Step 2. - Elbows should stay straight

Step 3. - Hold it for time/reps

Step 4. - Start at an active hang: https://www.youtube.com/watch?v=HoE-C85ZlCE

Step 5. - Progress towards a 90 degree in your shoulder