Your yoga teacher should have completed a yoga teacher training course that lasted at least one year and included classes on how to do yoga and classes on how to teach yoga. The training should have included an apprenticeship (teaching under a certified and experienced teacher), and certification exams.\012
There are many different types of yoga. Each type has its own philosophies and practices. Some styles of yoga are meditative and focused on spiritual centeredness. Other styles of yoga are more physical and based on poses or exercises