If you hold a credential from the Yoga Alliance, you are certified to teach yoga anywhere in the globe. The Yoga Alliance offers three distinct programs: the 100-Hour YTT, the 200-Hour YTT, and the 300-Hour YTT. There are also a number of rigorous classes available in a variety of yoga styles, such as Ashtanga Vinyasa and Hatha, as well as programs in yoga therapy and Ayurveda. Only after thorough testing by the Yoga Alliance has it suggested these classes. When looking for a trustworthy yoga school, your best bet is to pick one that has earned approval from the Yoga Alliance.