Sry for the redundant plank lean check, but Alessandro's diagram in Marcus's post is that good. It offered a really clear working ground for that lean which just never seems to be enough! Can't help testing it multiple times. Below i tried two starting position. First video is knees and hands below a flat back. This is what i did yesterday at the office, and it seemed easy. Second is knees and hands below a rounded (shorter) back. This becomes considerably harder. I personally like the bodyline in the 1st video but the starting position in the 2nd, and apparently I'm not there yet. Is the lean in the 1st video good enough? Oh yea I'm also working on more protraction too...
Thank you!