Quite a selection of yoga exists in the Clarendon-Courthouse corridor and you're bound to find one that suits you. If you're looking for a simple but awesome, no-frills space, this is it.
I've only taken Mark's classes but find them to be a perfect balance of challenge, simplicity, and invigoration. He's a solid teacher who's welcoming but not over-the-top or pushy. He works with you individually so you really feel like you're learning something and improving with his teaching. Awesome. Highly recommended teacher, especially for the power vinyasa loving yogi/athlete who desires a simple but well-rounded detailed practice.