Iyengar - Moderate intensity yoga practice. There is very little focus on pranayama and meditation for beginning levels. The emphasis is on proper alignment - particularly for the spine and core of the body. Once the body is aligned correctly in a posture, the healing benefits and energy of the posture are effective. Beginners use props such as blocks, yoga ties, and walls to achieve proper alignment in each individual posture.
Instructors often have a thorough knowledge of anatomy and physiology.
Alters the state of consciousness to connect you with a realm of spiritual energy. Deeply spiritual, mystical style of yoga. You will probably sweat. I feel it should be at least 72 degrees to keep the muscles warm and limber throughout the flow. After the primary series is practiced regularly, and you have a sense of familiarity with it, you move on to the secondary series, third, and up to a 6th series.