Haha I can explain. I used to be a bit of a coke head, I was 18 yrs old and had gotten sent to a boys ranch for a probation violation(dirty pee test for weed). So any way I was really into parties, selling and snorting coke, and hadn't trained for about a year (dropped the football, and schooll for other activities). Just really unhealthy in general.
So anyway at this ranch you get feed 3 squares a day big ones. You get to sleep very consistantly and workout everyday if you wish. One of the counselors (sheriff in adult jail) , gave me a copy of this program to try, he had been giving it to the kids for a little while. So I figured my 1rm, it was 175 but before this it had been up to 230 so I tried 200 couldn't get anywhere near to moving it. So the first couple weeks it went up very dramatically, because of the first couple of adaptations, such as relearning the movement, and recruiting more motor units. On top of that I just ate, ran, lifted, and slept. I gained about 45 lbs(180-225) of bodyweight and trully looked like I was just off a cycle, I was huge and all rounded out. Al my friensd made jokes about how they were going to get arrested so they could get big.
So I think it was a mix of being out very out of shape when i started, and very consistent sleeping, eating, and training.