Anyone who still thinks yoga is for skinny bitches and the "spiritually enlightened" has never met Bernie Koehrsen. Having studied yoga asana for more than 12 years, Koehrsen believes that anyone, regardless of age, size or fitness level, can benefit from the practice. In his aptly named class, "Yoga Is for Every Body," students' experience levels range from first-timers to that one guy who has been coming for years and can totally put his feet behind his head. Koehrsen is nothing if not encouraging, though, and his insistence that laughter makes yoga easier ensures that no one feels like the slow kid in gym class. But that's not to say he makes it painless; after all, a truly rewarding corpse pose cannot be achieved without some sweat dripping in your eyes.