I must admit, I haven't come across Doug McGuff before. So I looked up what he does, and I fully agree with his (extremely) high-intensity stimulus routine of resistance exercise. I have been practicing this for many years now, though, interestingly, I came to it for a different reason. I have always been a hard gainer, that is, no matter how hard I train, I gain strength but very little muscle mass. So I started to experiment by increasing the intensity of the lifts but not the volume. I wanted to push the muscle across the stimulus threshold, in the same way as Doug is arguing. It really made a difference, which I amplified by switching to isometric mode.

I believe that a whole-body workout once a week may be sufficient to maintain muscle mass (or even increase it if you haven't done resistance exercise before). I'm doing a split routine 5 times per week, spending 30 minutes on each muscle group. That gives me slow but steady increases (which serves my vanity 😎).

Thanks for sharing MGuff's workout method!