Fat cells breaking down testosterone leading to low muscle content and low aggression in juveniles Fat weighs down the spine and leads to bad posture, which in turn leads to bad form. Fat adds excess wight to the body as a whole and makes it work harder to work. This effect compounds as fat people are usually inactive, leading them to tire more easily. The only way he could have used his weight to his advantage was to wrestle, but, without training, wresting is the most tiresome and difficult way to fight. He was an idiot for picking a fight, when he didn't know how to fight to begin with.