There are a lot of things that can be learned from the darker corners of athletics. You have doctors who view bodybuilders as cavalier amateurs of science. And then you have the bodybuilders who view the doctors as too conservative to do anything interesting. So I've tried to become the middleman for putting some of those pieces together.

Being called a huckster and a charlatan started several years ago, so that's something I'm accustomed to. In most cases, it doesn't bother me.

I think about willpower almost never. I realize for myself, trying to be more disciplined is pretty nebulous and it's often a slippery target. For me, I've just thought about incentives.

Having a size 9 foot is fantastic because almost all of the shoe companies do their prototyping in size 9, so if you visit a place like Nike headquarters, you can try every sort of wacky, out-there model.

People really do think they have to choose between high stress and high reward jobs, and low stress and low reward jobs.

What's the worst that could happen?

I encourage active skepticism - when people are being skeptical because they're trying to identify the best course of action. They're trying to identify the next step for themselves or other people.