Yoga has dozens of variations in philosophy and style. Some yogas (like Bikram) are structured as a physical workout. Others put an emphasis on meditation. Kundalini Yoga is a little of both, but with an added emphasis on consciousness that activates energy centers througout the body. Kundalini Classes can be a good workout, but it's teachers and students participate in each kriya (a series of postures, breath, and sound that work toward a specific outcome) with a quiet reverence more akin to a temple than a gym. If you like your physical exercise to come with a side of spiritual enlightment, Kundalini Yoga might be for you!