The term ' Yoga' is derived from the Sanskrit root 'yug' which means "to join" . It signifies union between the individual soul (jivatma) and the universal soul (parmatma). It aims at obtaining relief from pain and suffering. Basically, human evolution takes place on three different planes, namely physical, mental and spiritual. Yoga is a means of attaining perfect health by maintaining harmony and achieving optimum functioning on all three levels through complete self-control.

Yogic kriyas, asanas and pranayama constitute the physical basis ofyoga. The practice of kriyas and asanas leads to excellent circulation. It also energises and stimulates major endocrine glands of the body. Yogic exercises promote inner health and harmony, and their regular practice helps prevent and cure many common ailments. They also help eliminate tensions, be they physical, mental or emotional.

Pranayama slows down the ageing process. In ordinary respiration, one breathes roughly 15 times a minute, taking in approximately 20 cubic inches of air. In pranayama the breathing rate is slowed down to once or twice a minute and the breath inhaled is deep and full, taking nearly 100 cubic inches of air.

All yogic exercises should be performed on a clean mat, a carpet or a blanket covered with a cotton sheet. Clothing should be light and loose-fitting to allow free movement of the limbs. The mind should be kept off all disturbances and tensions. Regularity and punctuality in practicising yogic exercises is essential. Generally, 5 a.m. to 8 a.m. is the ideal time for yoga practices.

Yoga asanas and pranayama should be practised only after mastering the techniques with the help of a competent teacher. Asanas should always be practiced on an empty stomach.

Shavasana should be practiced for a brief period before starting the rest of the exercises as this will create the right mental condition. Asanas should be performed at a leisurely slow-motion pace, maintaining poise and balance.

Herein are described certain yogic kriyas, asanas and pranayama which have specific therapeutic values and are highly beneficial in the maintenance of health and the healing of diseases.