It is available through Kindle Unlimited. Alas! It suffers from a bunch of stuff that is currently popular and that can be summarized as, Our Paleo Ancestors Were In Great Shape. Her version is Caveman Didn't Have Love Handles.
Well, I don't know what we've got in the way of paleo representation of cave _men_. But we have some representations of women from the paleo period.
Just go to images.google.com and type in paleolithic venus. And tell me that woman is the shape you aspire to, with your cavemen didn't have love handles thinking.
I am pretty sure I read past the 10% point in the Resiliency book and equally I am pretty sure I won't finish the book. She may or may not have a great program, but I was unable to slog through the terrible anthro/ancient history/theory part at the beginning, because, So Much Wrong.