In this treatise Swatmarama introduces Hatha Yoga as preparatory stage of physical purification that the body practices for higher meditation. The Asanas and Pranayama in Raja Yoga were what the Hindu Yogis used to physically train their body for long periods of meditation. This practice is called shatkarma . The word Hatha is a compound of the words Ha and Tha meaning sun and moon ( | || ), referring to Praana and Apaana, and also to the principal nadis (energy channels) of the subtle body that must be fully operational to attain a state of dhyana or samdhi. According to the Monier Moneir-Williams Sanskrit Dictionary, the word "hatha" means forceful.
Yoga means to yoke, or to join two things together, hence hatha yoga is meant to join together sun (masculine, active) energy with the moon (feminine, receptive) energy, thus producing balance and greater power in an individual.
It is said that on a lonely island, assuming nobody else would hear him, he gave the knowledge of Hatha Yoga to Goddess Parvati, but a fish heard the entire discourse, remaining still throughout. Lord Shiva took mercy on the fish (Matsya) and made him a siddha, who came to be known as Matsyendranaatha. Matsyendranaatha taught Hatha Yoga to Chaurangi, a limbless man who was given hands and feet by Matsyendranaatha just by looking at him. Hatha Yoga Pradipika mentions Adinaatha, Matsyendranaatha, Gorakhanaatah and many other yogis who became famous Hatha Yogis.
The Hatha yoga predominantly practised in the West consists of mostly asanas understood as physical exercises. It is also recognized as a stress-reducing practice.
Both of these are commonly referred to as Sadanga Yoga, i.e., Yoga of six parts ('sad' meaning six and 'anga' meaning limbs). The six limbs are described below in detail. Svatmarama emphasizes many times in his Hathapradipika text that there is no Raja Yoga without Hatha Yoga and no Hatha Yoga without Raja Yoga. The main difference is that Raja Yoga uses asanas mainly to get the body ready for prolonged meditation, and hence focuses more on the meditative asana poses: Lotus Posture Padmasana, Accomplished Posture Siddhasana, Easy Posture Sukhasana and Pelvic Posture Vajrasana. Hatha Yoga utilizes not only meditative postures but also cultural postures. Similarly, Raja Yoga's use of Pranayama is also devoid of extensive locks Bandhas.
The basic text of Hatha Yoga is Hathapradipika by Svatmarama, a grand desciple of Sahajananda (from the lineage of Sopana, the younger brother of Jnaneshwar Maharaj of Alandi near Pune). An important part of hatha practices is awakening of Kundalini. The signs of success in hatha yoga are slenderness of the body, cheerful face, hearing mystical sound, bright eyes, sense of well-being, control over the bindu, increase in gastric fire and purification of the nadis.
Ten yamas are codified in numerous scriptures, including the Hatha Yoga Pradipika compiled by Yogi Swatmarama, while Patanjali lists five yamas , and five niyamas (disciplines) in the Yoga Sutra.
Source: Wikipedia > Hatha Yoga
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