While secret societies have terrific members-only benefits, their gorilla-centric initiation rites are often illegal. Make a solemn fitness vow that's legal with today's Groupon: for $39, you get two months of unlimited Jazzercise classes in the Baltimore area. The value of today's Groupon varies depending on the location selected and can get up to $128 including the cost of a two month membership and the joining fee. Enter your address or zip code here to find the class nearest you and check to make sure it's on the full list of all 20 available locations here.

Jazzercise is 60 minutes of cardio, strength training, and stretching that incorporates moves from hip-hop, yoga, Pilates, jazz dance, kickboxing, and resistance training with handheld weights. Dancing with the Stars' multiple-champion Cheryl Burke is a big fan of Jazzercise's improvisational workouts, though luckily you won't need her dance moves to get the most out of your class. If you're prone to first-class jitters, though, you can review the basic moves online before you go. Expect to burn off up to 600 calories with each go-round.

Just as varied as the workouts are the class formats themselves. There are special Jazzercises geared to sculpt your bod, cut your workout time in half, or help you get those Rachel Dratch arms you asked for last Christmas. There's even a junior Jazzercise and Jazzercise team dance at some locations, which let you work out with your kids and teenagers. As for the ittie-bitties, childcare is available during select times at some locations.

If Jazzercise is a fleeting '80s memory for you, like your Betamax tape of ALF reruns or the "Frankie Say Relax" T-shirt you wear to do masonry work, today's Groupon gives you a chance to discover how the exercise phenomenon has evolved into one of the better total-body workouts available today. Just leave the hot-pink leotard in your glove compartment.