You are using an older browser version. Please use a supported version for the best MSN experience.

I'm addicted...to working out

Boutique fitness classes are no longer a trend. They're a multi-billion-dollar industry with millions of devotees around the world. CNNMoney's Vanessa Yurkevich talks to the people feeding your addiction.

Latest

Sport

Editor's Picks

World

image beaconimage beaconimage beacon