But the whole point of the book was to emphasize movement patterns over "body parts."
Yes, you're working the same muscles if you choose to do A and B workouts on consecutive days. But you'd be doing the same thing if you worked "chest" on Monday and "arms" on Tuesday, or "back" on Thursday and "shoulders" on Friday, or whatever the fashionable split is these days.
Even if you divided up upper- and lower-body workouts, and did, say, deadlifts on Wednesday, followed by "back" or "shoulders" on Thursday, you'd still be hitting the same muscles. What's the difference between a bent-over row and a Romanian deadlift? You're still mauling your back extensors, even if it's isometric in one and through a range of motion in the other.
Another point to consider is that you aren't doing max-effort lifts in the fat-loss programs. And you aren't being told to go to failure. Your goal is to create metabolic disruptions that will boost your metabolism and lead to fat loss. And what could be more metabolically disruptive than doing lower-body exercises on consecutive days?
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