A good quote from this article on Vulture.com:



Quote:
Was Wild an arduous shoot?
By far, this is the hardest movie I’ve ever made in my life. I didn’t hike a thousand miles, of course, but it was a different kind of physical rigor. I’d run up a hill with a 45-pound backpack on, and they’d say, “Wait, that backpack doesn’t look heavy enough. Put this 65-pound backpack on and run up the hill nine or ten times.” We literally didn’t stop shooting in those remote locations — we wouldn’t break for lunch, we’d just eat snacks. No bathroom breaks. It was crazy, but it was so wonderful. It was complete immersion, and I’ve never felt closer to a crew. We literally pulled each other up the mountains and carried each others’ equipment.