Dont know about prison strngth but theres a guy at my gym who has immense rage strength, scary dude about 230lbs maybe 6 ft tall, got under 235KG on the squat yesterday,eyes red, screaming frothing at the mouth,etc went ALL the way down, i mean literally sat down with it then powered back up. Then he shakes it off and smiles and jokes around with people! Def not the full ticket!