More and more guys are embracing group fitness. Why? Because group classes deliver science-backed muscle-building and cardio-enhancing tactics. Not sure how to get the most out of the new group ...

Etiquette experts share the faux pas to avoid in these workout settings.

Add Yahoo as a preferred source to see more of our stories on Google. Women spend more time in group fitness classes than men do. Why working out with others is good for you. (Getty Creative) (Thomas ...