All I'm going to say is that it's completely impossible to discuss this intelligently without defining the birth experience.
No it's impossible to discuss unless you can define what governs internal body mechanics, and an understanding of the basic body mechanics involved.
The fact that "friends in the yoga circle" share a similar opinion has no real bearing since I'd bet that 95% or more of those in yoga have the same misconceptions regarding "Internal" as those in the martial arts.
I apologize for coming off a bit harsh, but for anyone that can do these things, and that understands the logic and reasoning behind the conditioning and skills, you'd understand why the whole topic is nothing short of ludicrous.
It's like making an analogy with the throwing of bales of hay, it's both a trained skill and something that the body acquires through conditioning.
But to say that the female body can get a glimpse of what the skill of throwing bales hay is like through child birthing...
well I think you get the idea.
That being said, I'd posit that there is a "facet" of child birthing, especially with regards to breathing, and pressurizing of the body, that overlaps some of these skills. But unless you essentially worked on having a child everyday for several years, it's not something that merits discussion
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.
Hehehe, after a while passes and you start to be able to kick in the contradictory tensions properly, trust me, you'll sweat like a pig even in winter
It'll make you wish that all you had to deal with was sore muscles