I posted this question earlier as a response to an existing thread about another book that this one is sort of a successor to; but I think it may need its own thread.
I noticed that Troy Stetina wrote a new book called “Total PIcking Control - Expanded Speed Mechanics for Guitar” which was apparently published in late 2024 (i.e. somewhat after the above old thread). So I was wondering if the new book is a bit more modern and has some body mechanics/ CTC type material in it? It’s quite an expensive book, even when purchased as a Kindle, and although it gets a lot of positive reviews on Amazon UK, I would guess from what people say in the reviews that it doesn’t; but maybe somebody here actually knows? (It appears that the high price - for a book - is due to the book coming with a lot of associated video lessons.)