Hatha Yoga relates to the restraint of breath (Pranayama), Asanas, Bandhas and Mudras.
”Ha” and “tha” mean the union of the sun and the moon, union of Prana and Apana Vayus. Hatha means any tenacious practice till the object or end is achieved. Trataka, standing on one leg, (a kind of Tapas) and similar poses are all Hatha Yoga practices. Hatha Yoga is inseparable from Raja Yoga. Raja Yoga begins where Hatha Yoga ends. Raja Yoga and Hatha Yoga are interdependent.
Raja Yoga and Hatha Yoga are the necessary counterparts of each other. No one can become a perfect Yogi without a knowledge and practice of both the Yogas. Hatha Yoga prepares the student to take up Raja Yoga.
A Hatha Yogi starts his Sadhana with body and Prana; a Raja Yogi starts his Sadhana with his mind; a Jnana Yogi starts his Sadhana with Buddhi or intellect and will.
A Hatha Yogi gets Siddhis (psychic powers) by uniting Prana and Apana and by taking the united Prana-Apana through the six Chakras (centres of spiritual energy) to Sahasrara at the crown of the head. ARaja Yogi gets Siddhis by Samyama, i.e., combined practice of Dharana, Dhyana and Samadhi at one time. A Jnana Yogi exhibits Siddhis through pure will or Sat-Sankalpa.
A Bhakta gets Siddhis through self-surrender and the consequent descent of grace. Kriyas, viz., Neti, Dhauti, Nauli, Basti, Tratak and Kapalabhati belong to Hatha Yoga. All need not practise these Kriyas.
Those who have got much phlegm in the body should practise these Kriyas. Learn these under an expert Hatha Yogi. Hatha Yoga is not the goal. It is only a means to an end. Take to Raja Yoga after possessing good health.
Do Asana, Kumbhaka, Mudra and shake the Kundalini. Then take it to Sahasrara through Chakras in the Sushumna. O children of light! Will you drink not, will you drink not, the nectar of immortality?
Brother! Attain good health. Without health how can you live? Without health, how can you earn? Without health how can you get success in Yoga or any undertaking? Possess wonderful health through the practice of Hatha Yoga. Drink the nectar in Sahasrara and live in the immortal abode of Siva.