From Napoleon's great crab walk through Europe to J. Robert Oppenheimer's discovery of nuclear fission by kissing his own elbow, victory has always gone to the most flexible. Overpower enemies with today's Groupon: for $20, you get one month of unlimited yoga classes at Bikram Yoga Dallas (a $180 value).

The instructors at Bikram Yoga Dallas guide students through a series of invigorating poses in a welcoming, comfortable environment. Before leading classes, each teacher undergoes a nine-week intensive residential training with the founder of the Bikram school of yoga himself, Bikram Choudhury, mastering complex body shapes and advanced thermostat control. The 26 different traditional poses (asanas) team up with two breathing exercises (pranayamas) to strengthen muscles and joints and build sustainable health and wellness. As students limber up in 90-minute sessions, the well-ventilated, high-ceilinged studio is kept at a balmy temperature, boosting metabolism, increasing circulation and detoxification, and banishing argyle yoga sweaters.

Bikram Yoga Dallas’s sleek studio boasts 2,300 square feet of softly lit legroom, peppered with artwork from local painters such as Michael Ledoux. Before and after each class, students are invited to enjoy the comfort of the welcoming lobby, the convenience of the men’s and women’s changing rooms and showers, and the intricate contortions of the Bikram yoga secret handshake.