Jillian Michaels, one of the trainers from the Biggest Loser, has a radio show on every Sunday from 9-11am PST. You can listen to the show live, call in, or download them from the website once they are over.
The website for the radio station is www.kfi640.com
Her show really is very good, I download them and listen to them often. She usually has a planned topic that she talks about for an hour, like nutrition or exercise, and then she takes calls and answers questions for about an hour.