Let’s face it: there’s a good reason for our gymphobia. The gym usually sucks. Stuffy locker rooms. Bad techno. Sweaty equipment. Buzzing fluorescent lights. Grunters. It’s too easy to think of 1,001 reasons not to go. Strange, then, that reportedly 7.5 million people are flocking to Zumba classes every week. Are you wondering if it might be worth a try?