Exercise keeps the body in peak condition, which explains the marbleized weight machine lying next to Michelangelo's David. Enjoy an anatomical renaissance with today's Groupon: for $20, you get a one-month unlimited basic membership and two Curves Circuit with Zumba classes at Northwest Curves (a $99 value) at participating locations. This Groupon must be activated by December 30, 2011.

Northwest Curves, a fitness center designed exclusively for women, provides members with a 30-minute circuit of hydraulic resistance machines designed for an efficient cardio and strength training workout. During the training, attendees can burn up to 500 calories and work each major muscle group to work toward individual fitness goals. An experienced coach is always nearby to teach and motivate participants, and a soundtrack of fun, upbeat music cues participants to move on to the next station. Instead of fiddling with weight stacks and losing momentum, the hydraulic machines use your own body weight and fitness level to create resistance. Each machine uses push-and-pull motions to create toned, lean muscles perfect for crushing a grapefruit without looking like you can.

For a twist on traditional cardio, the Curves Circuit with Zumba ignites aerobic bursts with Zumba's Latin-inspired dance steps. Both the classic circuit and Curves Circuit with Zumba provide a complete aerobic and strength-training workout that raises heart rates and burns calories while allowing women to meet new friends or arrange a girls' night out between moves.