When was the last time you thought about Zumba? Be honest. Somewhere between the rise of boutique spin classes and hot yoga, it seems like Zumba quietly left the mainstream fitness conversation. But ...

NEW YORK (Reuters Life!) - There's a party going on next door. While you're dutifully pounding that treadmill, the Zumba folks are dancing their calories away. Taking a class in Zumba-high-energy ...