There are many types of yoga; Most types of yoga practiced in yoga centers today are derived from Classical Yoga described in the Yoga Sutras. None is superior to the others. Their application and techniques are different, but their purpose is the same; to relax the mind, strengthen the body and mind. The person should try and choose the type that suits him. The main components of all yoga classes are; poses (asanas), breathing (pranayama), meditation (dhyana).