I think a fit athlete would be able to do most of those poses & stretches, but not some of us that aren't fit to start with LOL

They don't address any part of the blood flow stopping in certain poses?? Unless I missed that part I skimmed it quickly

I'll have to read it again when I have more time.

I use this one quite often- works well for me
Sternal postitional swiss ball stretch
[A sternal
positional Swiss ball release was prescribed
to reposition the head over
the shoulder girdles and inhibit the
anterior neck muscles, to decrease
forward head posture and lengthen
the bilateral pectoralis major muscles.
This was done twice daily for
five repetitions and held for five
breaths]