I've thought about what I could accomplish in football, but when you read about Mike Webster and Dave Duerson and Ray Easterling, you read all these stories, and to be the type of player I want to be in football, I think I'd have to take on some risks that, as a person, I don't want to take on.

The 49ers drafted me assuming I wanted to play more than one year. At the time, I did, too. Things changed. They didn't deserve to be undercut. And I didn't want that to happen.

I'm involved in so many cool and interesting and redeeming things. I'm enjoying every day.

The men and women that are hired to take care of players' health, their salaries are paid by the team. Before games, you would see team docs and trainers, and they're every bit as as excited to, say, beat the Raiders as you are; their emotions are tied up in it.

I walked away from pro football and a $2.9 million contract with the San Francisco 49ers because I didn't want to develop CTE.