I saw on a BBC program that a typical Roman soldier had to march 20 miles a day with his full equipment and supplies. I've also read that the Mongolian Horde used a long bow that had a 160 lbs draw strength. basically the equivalent of pulling up 160 lbs with your index and middle finger back to your armpit. they did this every time they fired an arrow, and i'm pretty sure they fired lots of those in a battle. apparently they were also capable of hitting a target 500+ meters out (possibly on horseback). http://en.wikipedia.org/wiki/Mongol_bow There are other impressive facts too, like how a fully armored knight was expected to fight for hours at a time in a pitched melee battle with heavy shield and sword. and yet when they had volunteers do it for a BBC program (these were policemen, soldiers, firemen, etc.) they literally couldn't last 30 seconds before sucking air. Obviously their environment made them this way. But it still fascinates me when you compare someone from times past and they seem like supermen (physically, and mentally) today. I suppose the closest thing that comes close to that today are professional athletes. both pictures are clickable discuss.