Having a naturally high body fat % can be a huge advantage if the boxer is also well-conditioned, muscular and has a sufficiently big frame to carry it well: 1. Wrestling/clinching benefits (easier to push them and harder to push you, easier to hold and nullify their offense while punching them, harder to get their arms around your waist, more sweaty and slippery for them, conserve your stamina and sap their physical and mental stamina through leaning and domination in the clinch) 2. Psychological factors (underestimation, less bodily neuroticism, narcissism and pressure, greater fear of humiliation and loss for the opponent, mass as powerful and intimidating in itself) 3. Increased punch resistance (superior shock absorption and harder to knock down) 4. Increased punch power (provided the fat is not grossly excessive) The heavier man can have the confidence to box to his game plan knowing that he can always clinch if need be and have the advantage, which is a big weight off his mind and tactical advantage but the opposite applies to his opponent, who finds himself less relaxed and with fewer options to defend himself as clinching is a less effective tactic for him. Having the advantage in the clinch also enables the heavier fighter to clinch frequently in the earlier rounds, potentially hiding his own fatigue when he clinches later on as this strategy eliminates the tell. So why does fat get a bad rap when it's clearly so useful? One possible reason is that fat fighters are very bad for businesses; both as less marketable individuals and in how they reduce the marketability of the chiselled, low body fat % weightlifters they defeat and humiliate (encouraging yet more fighters to keep the pounds on) so the boxing industry has a strong incentive to discourage the creation and promotion of fat fighters in any way they can. Fat fighters also have a bad reputation because they are overrepresented among undisciplined journeymen and because fat people in society generally tend to be unathletic and unfit.