[nobrains]

Can anyone please direct me to a picture / image / illustration / animated-gif of the position being referred to in the paper?

[SapporoChris]

I'm not certain, but I suspect it is similar to this.

https://files.tofugu.com/articles/japan/2015-10-23-bowing-in...

But from the description in the article, add a platform, the bowed head is extended off the platform and down lower.

[terrycody]

Yes, there is not even 1 single image or video try to explain this, its weird, author should post more details.

[cinntaile]

I don't know about the method in the paper but if you suffer from this, try doing glute bridges.

[Giorgi]

Yeah, that would be nice, can't understand gibberish he/she explains, I think it is some sort of doggystyle with head bowed down?