The commonly taught "six exercises" are outlined in Phagmo Drukpa's "Verses on the Path Technology: A Supplement (Tib. Thabs lam tshigs bead ma'i lhan thabs)" as follows:There are six exercises for purifying the body: filling like a vase; circling like a wheel; hooking like a hook; showing the mudra of vajra binding, lifting upward toward the sky, and then pressing downward; straightening like an arrow, and then forcefully re-leasing the air in the manner of a dog heaving; and, in order to energize the passageways and blood in the body, shaking the head and entire body and flexing the muscles. These are the six.The first exercise is particularly important, as it is a "kumbhaka" (vase breathing) breath retention practice, in which one breathes deeply into the navel and holds the breath there for as long as one can. This breath hold technique is also applied in tummo. According to Tsongkhapa, these six are to be done in conjunction with the hollow body contemplation. This practice will allow one to feel much joy, and also will help prevent any injury which might arise from the changing flow of the vital winds resulting from the practice of the six yogas.