Body control & sound health is the basic aim and is achieved through practice of hatha yoga in Nepal. One must be sufficient to perform yogic practices, including kriya yoga, with ease. Health is of utmost importance, not only for more advanced kriya yoga practices but for everyday life. If you have some disease or pain it is very difficult to think of anything else, let alone try to practise kriya yoga or any other higher form of yoga practice. For this reason, the initial aim of yoga should be to make you radiate health by removing existing ailments or by improving your present condition of health. It is by doing asanas, pranayama and various body cleansing techniques, that we can attain the required state of vitality.
Once we have attained sufficient body control and health, then the practices of kriya yoga become very easy, for one's awareness can follow the kriya yoga techniques without being continually disturbed by body discomfort or illness. One can actually forget the body and direct the awareness in other directions.