I’ve been doing GMB programs for a few years now, and I think they’re terrific. I’m a middle-aged office worker, and a mediocre runner: I do 20-ish miles a week, pretty slow. So my cardio fitness is okay, and I’m reasonably strong, but I’ve always been extraordinarily unflexible, stiff, and clumsy — in that sense, totally unathletic. I’ve never touched my toes with my legs straight and squatting with my heels on the ground is immensely difficult and awkward. GMB programs have helped with that more than anything else I’ve tried. I’m still less flexible than most people, but I’m folding forward much more easily and squatting more easily, both of which are really convenient for day to day life. They’re very difficult for me — in a couple of years of doing them I don’t think I’ve rated the quality of a workout better than “Rough” — but they seem to be helpful and beneficial even when you’re doing them really badly, which I am. And the variety and progressive nature keeps me engaged. Some things I don’t know if I’m ever going to make much progress on, like the Frogger stall, but continuing to cycle through the different programs is definitely good for me and I don’t see myself stopping anytime soon.