Trembling of the body during pranayama is known as kampana. This is experienced by a practitioner of yoga in two different ways. Patanjali has mentioned in Yoga Sutra (I.31) five situations which arise in the wake of the nine obstacles on the path of Yoga. They are – pain, mental dejection due to frustration of desire, trembling of the body, forcible inspirations and forcible expirations. The trembling of the body parts caused by lack of stability is a situation which puts an obstacle in the practice of posture for sitting in meditation. To overcome all these five situations Sage Patanjali has recommended the practice of pinpointedness (Yoga Sutra I.32). The other way of experiencing trembling is associated with prolonged practice of pranayama. It is described in Hatha Yoga Pradipika (II. 11-12). It is recommended by Swatmarama that a sincere student who wants to derive the full benefits of pranayama should practice it four times each day. And at each sitting one should pra