Swimmer Katie Ledecky on Chinese doping scandal and the Paris Olympics

Days off do not exist for Katie Ledecky. "I swim nine to ten times a week, for two hours at a time," she said. By her own estimate, Ledecky swims up to 70,000 meters – roughly 43 miles – each week, as she gears up for the Paris Olympics next month. And if that isn't enough, after hitting the pool, she hits the weights.

"I love the distance races, I love the training," Ledecky said. "Really, if the competitions didn't exist, I think I would still love it."

She's won 10 Olympic medals, seven of them gold, and has more individual Olympic gold medals than any woman swimmer in history.