"It was not until the late 1950s, when Dmitry reached manhood, that they first trapped animals for their meat and skins. Lacking guns and even bows, they could hunt only by digging traps or pursuing prey across the mountains until the animals collapsed from exhaustion. Dmitry built up astonishing endurance, and could hunt barefoot in winter, sometimes returning to the hut after several days, having slept in the open in 40 degrees of frost, a young elk across his shoulders."
It's nice to know that humans haven't grown so far out of the wild that, upon being thrust back into it, a person can still "regress" back to the hunters we were. Strong, fast, and tough