Yoga is the science of right living and, as such, is intended to be incorporated in daily life. It works on all aspects of the person: the physical, mental, emotional and spiritual. The word yoga means 'unity'. In spiritual terms, this unity is described as the union between the individual consciousness and the universal consciousness. However, on a more practical level, yoga is a means of balancing and harmonising the body, mind and emotions. This is done through the practice of asana (physical postures), pranayama (breathing techniques), mudra (body gestures), bhanda (energetic body locks), shatkarma (purification practices) and meditation.
"Prior to everything, asana is spoken of as the first part of hatha yoga. Having done asana, one attains steadiness of body and mind, freedom from disease and lightness of the limbs" - Hatha Yoga Pradipika (1:17)