In my mind, its about 25 percent physical fitness, 25 percent mental grit and 50 percent just staying healthy in the altitude. The altitude is the biggest concern.

We were going to go this October, but my wife got pregnant.

I expect because of the full moon and the season it'll be pretty crowded. It's a good season to go: not too hot, not too cold.

A couple guys got sick last time (at Mount Everest), but everyone made it to the top.

I try to not have it be the focal point in my mind, but I realize that it's a violent sport and serious injuries do occur.

I never minded if people disagreed with me. And I hope people didn't mind if I disagreed with them, if we could talk it out and work it out and eventually come to some kind of consensus view.