The only thing about this book that is specific to plus-sized women is the part of intro and part of the conclusion and the photography, and all of them belong in regularass books about strength training, not just a specialty one. It was nice to see full-color photographs of powerful women of different colors and larger sizes demonstrating proper form for exercises, and there's no reason (well, there are reasons, but no defensible ones) not to have them as models in any old book about strength training.
What this really is is the best-written guide I've read (I've been going on a Human Kinetics bender this week and reading a lot of their titles, and I can genuinely see progress in how they cover gender and body size tracking alongside the original pub dates of the books) about beginner strength training, but I don't particularly like the conflation of "plus-size" and "beginner," and ironically I don't think the author would like to conflate those concepts either, since she and I agree with the actual scientific conclusion that body size and mass do not tell you anything about that body's health or fitness level. There were a few nods to how larger bodies may look or feel different slotting into machines, but not as many as might actually be necessary or most useful. I know one thing that is frustrating about fitness equipment is that it's really great for forcing you to have proper form when an exercise is new, but it also is limiting because it's built for the average, lean adult man, so if you have larger thighs or a bigger stomach or boobs or less height or whatever, some things may literally be impossible not because it's impossible for your body but because it's impossible for the machine to accommodate your body, which is a problem with the machine, not your body. I'm not plus-sized, though I am "fat" for a fitness instructor (which is a little like being a plus-sized couture model in that it's dehumanizing and misuse of words and pseudoscientific and also completely silly because you can recognize that you are still not suffering anywhere near as much as the people who are bigger than you but it's also still a legitimate hurdle because the world you're working in refuses to fit you in their paradigm) and have an extremely large bust, so I have not equivalent but parallel experiences of "oh, this thing we made for a standard-sized thing doesn't fit you? You are the problem, not the thing that doesn't accommodate you," and I'm not trying to say those are the same, only that I use that as a referent when thinking about how I as a skinnier-than-some, fatter-than-others fitness professional can design a workout for someone larger than I am and be affirming and accommodating in my language and framing, not just my design. I hoped to get a few more pointers from this book via specific instructions on how to modify an exercise or a piece of equipment for larger bodies, but I didn't really get a lot of that, and that also makes me wonder if that's then going to be useful for larger-bodied people.
I like that Summers used cues about how you should feel, since something a lot of fitness professionals do badly is translate so-called standard cues or corrections to larger bodies ("your thighs should do X" or "your spine should touch X" and cues like that aren't neatly applicable to all sizes, and relying on visual cues like that means you don't necessarily catch bad form or honor good form because you're used to those very specific embodied cues that only work on a specific subset of body types), but overall this was more just a beginners' guide, and that should have been more directly communicated to the reader so that plus-sized experienced athletes and fitness enthusiasts skip it in favor of something more advanced. Like on the one hand I can see the appeal of a book written for a specific group of people so they know they'll get to see pictures of people who look like them and so on, because I advocate for that type of affinity and mirror book all the time, but there's just kind of a disconnect between the actual content and the promise of the title. Very good stuff, just not exactly the stuff I hoped for.