GMB made working out fun for me, and I've never felt better. Exercises are explained carefully and they feel playful on one hand, and well thought of on the other. Compared to other workout programs which just basically make you do more, More, MORE!, the GMB programs are focused more on your own limits and needs. Where are you today? What would happen if you tried this today? Can you handle this variation? Try it. If it's not a succes, why not scale back a bit. It's much more coaching / self regulating and much less drill sergeant. I was a bit on the fence about the cost of the programs at first but once I've experienced the joy of it, I was (and am) all in.