Alex Honnold

Seven years ago, when I started free soloing long, hard routes in Yosemite - climbing without a rope, gear or a partner - I did it because it seemed like the purest, most elegant way to scale big walls. Climbing, especially soloing, felt like a grand adventure, but I never dreamed it could be a profession.

There's a constant tension in climbing, and really all exploration, between pushing yourself into the unknown but trying not to push too far. The best any of us can do is to tread that line carefully.

Yosemite has the most impressive and accessible granite big walls in the world. The rock is amazing. And because of that, it's been the mecca for climbing in the U.S. - and the world to a large degree - for all of climbing history. It's the place to test yourself against the historic routes of the past.

I'm sponsored by the solar company Goal Zero, and they were gracious enough to install panels on my van and a nice battery system for the inside. I have lights and a fridge inside the van. And of course I had panels installed on my mom's house.

I've tried to approach environmentalism the same way I do my climbing: by setting small, concrete goals that build on each other.

I feel that a lot of human spirituality stems from the belief that we are unique and special in the universe, but maybe we are just what happens when there is proper temperature and proper distance from the right type of star.

My friends like to remind me that I have relatively weak fingers. Aerobic strength and general endurance have come easy, but finger strength has always been my biggest weakness.

I think it's great that so many people are enjoying climbing. I've always loved climbing; I don't see why other people wouldn't enjoy it just as much. As long as everyone does their best to respect the areas in which they're climbing, I don't see how the growth of the sport could be a bad thing.

When I was a teenager, I did a lot of pull-ups and push-ups. Every night before bed, I'd do 150 - in sets of 30 or so. Looking back on it now, I'm not totally sure that's the best way to improve as a climber. But it did make me a lot better at doing pull-ups and push-ups.

I've done routes where I've climbed 200 feet off the ground and just been, like, 'What am I doing?' I then just climbed back down and went home. Discretion is the better part of valor. Some days are just not your day. That's the big thing with free soloing: when to call it.

Much as Africa has leapfrogged straight to mobile phones, it has the opportunity to skip the dirty, grid-tied power plants that currently operate across the developed world and go straight to clean, distributed power.

I've gotten over my shyness from many years of doing public events.