<div class="quoteheader"><div class="topslice_quote">Quote</div></div><blockquote class="bbc_standard_quote">It confuses me a little to try to figure out how the carrying part would affect his endurance while running.  I don't want him to be super-strong, but if his body can handle super-long-distance running at super-speed, how much weight can he run with comfortably, or with difficulty?<br/></blockquote><div class="quotefooter"><div class="botslice_quote"></div></div><br/>He can handle as much weight as if he didn't have super-speed. So, whatever a very fit young man could normally do. When he's running full speed, it's like a normal person doing a good-paced run/fast jog. That's probably the best way to look at it. I'm viewing this as his super-speed doesn't necessarily give him greater endurance, it's more of a physics dodge. So, his body isn't preternaturally strong to allow the super-speed, but something else is going on that's more sophisticated. In addition to the super speed, he's also avoiding certain laws of physics like momentum, friction, and inertia (going from 0 to 900 in an instant should kill him, but he doesn't feel a thing). I was originally thinking he would have to be superstrong to withstand all of that, but then he would have to be Superman strong when you think about it, so there must be something else going on.