Start early and begin raising the bar throughout the day.

I have made a lot of mistakes raising the four Jenner kids.

Honestly, since the Diane Sawyer piece, every day it's like, it's exciting to go to the mailbox... Because I get letters every day from all of these people from all over the world.

It hurts every day when you practice hard, but when this decathlon is over, I got the rest of my life to recuperate. Who cares how bad it hurts?

I spent 12 years of my life, the last six years training six to eight hours a day, every day of my life. At the time, when I was 20 to 26, I could do things like that, and you're not going to notice it.

My knee has always given me problems. But it got to the point where I actually had to start giving up things. And I hate that.