Hour. hip-hop dancing, athletic drills rolled into one. this is the one and only celine johnson. she is the skraert -- creator and author of a "new york times" best-selling book. what is it about turbo that keeps people coming back? >> people love it because it's an experience. you don't feel like you're exercising. you have a great time. positive, uplifting. people have great dance moves and burn a ton of calories. >> it is more of a party environment. tell me how people who are pregnant or out of shape can do it? >> it is for a lot of different fitness levels. you can self-regulate. people c...