Well, longer rest times will certainly give better results for isolated sets. I think the short suggested rest times might be a strategy to train muscles for greater endurance (hence making 100 continuous pushups more likely at the end of the program).
Not a bad way of looking at it, but I'm not sure I could've even finished all the sets without taking longer than a minute to rest. Maybe I'll try to shorten the breaks up a little next time, but we'll see.
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