Some people want a yoga class that will make them sweat buckets or work their muscles so hard they'll be walking like a bowlegged cowboy all week. But if you're just looking to relax, mentally and physically, while getting a moderate workout, Yoga Warehouse has the formula. The yoga style is Hatha, which means there's emphasis on breathing exercises (that's pranayama to the yoga elites). The classes take place in an airy warehouse space that's cooled by fans. The vibe is friendly and intimate, with room for only about a dozen students. Most of the regulars are focused on enjoying the practice rather than showing off with complex strength postures and tortuous balancing poses. That is, until a train comes rumbling by on the tracks just outside.