You can alter mood by running.

Running is an effort to escape from comfort zone.

There is a whole new breed of marathoner who wouldn't even have considered running something like a marathon. In the past, people ran if they were exercise junkies. The marathon held the ultimate challenge for them.

To me, running a marathon is one of the ultimate challenges in sport. And for her to do it that many times, wow, she is a strong person. She knows her body, and she knows what she is capable of doing.

It's pretty intense. It's not like running a marathon, but it is a mental strain.

When I explain it to people I tell them the decathlon is like running a marathon. You really can't get another one in. It takes a lot out of you. It takes a couple of weeks to recover.