Which boxers in history had/has freakish genetics and if so why did you pick them? For example Sonny Liston had freakish genetics because of his long reach and huge fists
Just a few low hanging fruit. Sam Langford Barbados Joe Walcott Jose Legra Mike Tyson Jorge Castro Panama Al Brown (spelling?) Sung Kil Moon Bob Foster Jake LaMotta Joe Grim
I always felt Jean Pascal had an enormous amount of physical talent but never developed beyond a mid-range banger unfortunately.
Nicolino Locche. Dude's reaction times were so off the chart quick that he makes guys like Jones and Mayweather look positively glacial in their responses to movements of their opponents. Insane genetic gift there. Dude could probably have been amazingly good at anything involving reaction times.
For builds, Weaver and Norton were immeasurably blessed. Didn't always do them a lot of good but still...
Not all boxers with freakish genetics benefitted from what nature bestowed. Johnny Owen had a very thin skull, and this wasn't discovered until after he'd been knocked out in a world title fight, and by then it was too late because he died from his injuries. His legacy is that professional boxers are supposed to have tests to measure their skulls and avoid a repeat of the tragedy suffered by Owen.
I remember hearing that his autopsy showed a freakishly large heart. I suspect Harry Greb may be similar in this sense. Something special that just made him tireless.
Probably Fitzsimmons. A heavyweights upper body (for his day) with a lightweights legs, that allowed him to be a middleweight. From the same era; Jeffries was extremely muscular for all the endurance work he was doing in training. Jeffries on a modern diet (not even taking PEDs in consideration) is something interesting to think about. Weight loss and 'drying out' was big in his day, but he was still reported to be around 230 at times. In his autobiography I think he said he felt good at 240 or something like that.