Sleep. If I didn't skip it, it's not mentioned in the article, but it's very important in my experience. If you don't sleep enough, going through with a reduced calorie intake will be much harder. I personally tend to overeat if I haven't slept for more than 6 hours the last night. Lost 88lb a long time ago within a (too) short time.
after life got busy i started doing the same for saturdays, too, and pushed the sat workout stuff to other days. didn't see any loss of performance or size, and felt much, much better.
big part of it, tbh, was because these were college-ish times and not staying out drinking == better overall sleep and health. yeah missed out on a couple of ragers, but also didn't really have any problems meeting people & staying social.