Anyone with decent internal skills had a tremendous amount of certain physical conditioning
No kidding. I just finished my first 10 days of doing your exercises. I am frickin sore all over. Mainly upper back, lats, back of my legs, and obliques. Good stuff.
It is interesting. Never broke a sweat, everyday felt like I needed to do more when I stopped. by the end of the 10th day though I am pretty sore.
I am doing it at work as well as paired exercises with a partner. We get called all kinds of names and get eye brows raised.