I'm not making an excuse, in fact, I would place myself among the genetically gifted. I bench press over 250 lbs without training upper body and have always been able to full squat 1.5 x BW, even the first time I stepped into a gym.
Similarly, I have a hard time not putting on muscle, so I have to neglect upper body so as not to get too heavy. I often have ice cream or something similar for breakfast, yet I've always been able to see my abs. Some people are just built to succeed.
A good analogy is that I have gone to school and done nothing but showed up and just done the work. Last year, I took 31 credits and studied for maybe 10 hours total, for all my classes combined for the whole year. I have a 3.6 GPA. When you're really good at something, all you have to do is show up and work, things take care of themselves from there.
So, my post was not an excuse, it was the truth. And as for all prisoners having great genetics, a good deal of them descend from west Africa (a pity that such a high percentage of one population end up in prison).
As has been discussed before, the slave trade was a selective breeding process of sorts that left only the strongest humans, from whom today's African-Americans descended. West Africans have some of the best 'athletic' genetics of any population, as evidenced by the freaks that end up in professional sports.
Good endocrine profiles + lots of fast twitch fibers + hard work = big strong mo-fo.