Now I say that if you run more than 15 miles a week, it's for something other than aerobic fitness. Once you pass 15 miles, you do not see much further improvement.

We are involved in youth testing internationally. We want to try to prove without a shadow of a doubt the relationship between physical fitness and health, not just physical fitness and ability to perform.

I've had one very bad ankle injury but otherwise I've been incredibly lucky with my fitness. I've worked hard at it and I've always been fit even compared to other players. That sustains you through various parts of your career, but I am 36.

I'm healthy now. I probably wouldn't say I'm at my best fitness level and I haven't played that much lately, but I'm healthy and that's all that matters.

For years, I always thought it was hilarious that I was this fitness guru, because fitness was just a tool I utilized to help people improve their confidence. For me, it's never been about fitness. It's always been about helping to empower people.