He was born with a rare whatever. Its kinda like that shit those massive ripped bulls get. He used to be top ranked in arm wrestling, probably still is. I wonder how he'll do in slap fighting.
Low myostatin and double muscle is what causes Belgian blues to be so huge, the lower mysostatin is, the more muscle you can develop.
I don’t think that’s what Dabe has going on though, although you might be right.
There is a German arm wrestler called Schlitte, he has some sort of double forearm bone going on as a result of a bone disease, similar thing to Oleg Zhok but I think his is different and it is a muscular hypertrophy disease.
Dabe looks like he has a combination of both