Joe Smith Jr. spent years as a union 66 laborer busting concrete. He is a known power puncher. Arguably the hardest puncher p4p in the sport. Did all those years spent on the job help him punch extremely hard?
You don't stop work when you get tired, you gotta power through or your looking for a new job and you usually work 50 weeks a year, not 8 weeks every 6 months. Wasn't Fitzsimmons a bricklayer? And didn't Sonny Liston's father use him as a plow mule? Guy was worked so hard at a young age that his body distorted. Reportedly 84" reach, telephone pole jab.
His power is over rated imo He couldn't make a dent in Vlasov and it took him many rounds of teeing off on Geffard to get him out of there I'm not sure what plan he has but he'll need to bring something extraordinary next weekend
Manual labour sure won't do him any harm, and fighters who did not have manual labour background, sometimes have rolled their sleeves up and done some hard graft to toughen up as Gene Tunney did at a lumberjack company. In a way the manual labour is a good motivator to work hard at the boxing, the money he makes as boxer sure is better than that as a manual worker.