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Sure. There's clearly genetics involved but ultimately these superhuman feats are basically mostly incredible determination, single mindedness and tolerance of discomfort.
Was chatting about this with a mountain guide (with a 38BPM RHR) last week. He reckoned genetics are the deal breaker but most of it is a person's willingness to suffer for an objective.
In his case he personally believes his insane endurance capabilities are because when his school friends were playing Nintendo, his Grandad was making him carry the deer he shot down from the mountains.
Stonehedge
It's very impressive what a person can achieve when they set their mind on it.