Lung means wind or breath. It is a key concept in the Vajrayana traditions of Tibetan Buddhism and has a variety of meanings. Lung is a concept that Is particularly important to understandings of the subtle body and the Three Vajras. Traditional Tibetan medicine practitioner Dr Tamdin Sither Bradley provides a summary:The general description of rLung is that it is a subtle flow of energy and out of the five elements it is most closely connected with air. However it is not simply the air which we breathe or the wind in our stomachs, it goes much deeper than that. rLung is like a horse and the mind is the rider, if there is something wrong with the horse the rider will not be able to ride properly. Its description is that it is rough, light, cool, thin, hard, movable. The general function of rLung is to help growth, movement of the body, exhalation and inhalation and to aid the function of mind, speech and body. rLung helps to separate in our stomachs what we eat into nutrients and waste products. However its most important function is to carry the movements of mind, speech and body. The nature of rLung is both hot and cold.
Apart from classical Mahāyāna Buddhist practices like the six perfections, Tibetan Buddhism also includes tantric practices, such as deity yoga and the Six Dharmas of Naropa as well as methods which are seen as transcending tantra, like Dzogchen.
In Tibetan Buddhism, practices are generally classified as either Sutra (or Pāramitāyāna) or Tantra (Vajrayāna or Mantrayāna), though exactly what constitutes each category and what is included and excluded in each is a matter of debate and .
Tantra are the esoteric traditions of Hinduism and Buddhism that developed in South Asia from the middle of the 1st millennium CE onwards.
The term tantra, in the Indian traditions, also means any systematic broadly applicable text, theory, system, method, instrument, technique or practice.
A key feature of these traditions is the use of mantras, and thus they are commonly referred to as Mantramārga ("Path of Mantra") in Hinduism or Mantrayāna ("Mantra Vehicle") and Guhyamantra ("Secret .