Seriously, it's a shitpost but it's also unironically one of the strongest non-cheese-strat starts for building up stats. Provided you don't get maimed or killed outright, the guards in Rebirth just patch you up, you can't starve to death, and it automatically gives orders to your character so they'll be moving constantly as long as you animation cancel all the actual work now and then, letting you semi-afk train strength on max speed.

I think there's supposed to be another step first (similar to how getting enough sneak and athletics to be able to just leave whenever you want is helpful), getting a bit of martial arts skill up so you pass the threshhold needed to train effectively by fighting the guards 1v1 at night after knocking one of the two in a given building out, but that's the gist of it: get locked up in Rebirth, continuously remove your shackles and put them in your inventory so they'll give you more and you can get overloaded enough to strength train, train the assassin skill on other prisoners while they're locked up and then on guards once you can, and bare knuckle box the guards to build toughness and martial arts.