"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." If you're not a regular at your local spin class, chances are you'll still have some preconceptions about ...
To the happy, you-gotta-move-with-it music, Karen Lauer pedals fiercely on her stationary bike at the front of the room, urging participants in her spin class to do the same. As the song trails off, ...