Cool, thanks for the info. I have run two full marathons in 2:45 and 2:38, but it wasn't hot and didn't have very much elevation gain or loss(Air Force Marathon '05 and '06). My training was as flat as you can get and I really wasn't exposed to hilly running until I moved to Flagstaff this past Octo...

Well, I guess I'd like to know the main things one NEEDS to bring along while still staying as light as possible. I would like to cross in under 5 hours. Also, it may sound like a weird question, but do you have any pointers on running downhill relatively efficiently? I feel like I'm really bad at i...

Does anyone have experience with running north rim to south rim? If so, I'd like to pick your brain about a few things...I'm planning on running it for time in October if all goes well. Thanks!