Prana
Prana is, in the Hindu tradition, the vital breath or subtle energy that animates every living being. It is one of the key concepts of yoga and Ayurveda, and finds equivalents in other cultures under the names qi (Chinese), ki (Japanese), or pneuma (Greek).
Origin and etymology
The Sanskrit word prana is formed from the prefix pra- (forward) and the root an- (to breathe). It literally means breath that moves forward. The concept appears in the Vedas (between 1500 and 500 BCE) and is developed in the Upanishads, notably the Prashna Upanishad (c. 500 BCE), which offers a systematic philosophical analysis of it. The classical yogic tradition, codified by Patanjali in the Yoga Sutras (c. 200 CE), distinguishes five main breaths (prana, apana, samana, udana, vyana) that govern different functions of the subtle body. Ayurveda, traditional Indian medicine, uses this scheme for its diagnoses and treatments.
Evolution and tradition
The doctrine of prana is central to medieval Hatha-yoga, codified by the Hatha Yoga Pradipika (15th century). Pranayama, the control of breath through respiratory exercises, aims to direct and purify prana along the subtle channels (nadi). Western diffusion of the concept began at the end of the 19th century with Swami Vivekananda and the neo-Vedanta movement. In the 20th century, masters such as Krishnamacharya, B.K.S. Iyengar and T.K.V. Desikachar taught precise pranayama techniques in the West. The concept of prana is related but not identical to Chinese qi (traditional Chinese medicine, taiji, qi gong) and Japanese ki (aikido, reiki).
Practical use
Practical work on prana proceeds mainly through pranayama: conscious breathing exercises. Classical techniques include nadi shodhana (alternate-nostril breathing), kapalabhati (cleansing breath), bhastrika (bellows breath), ujjayi (victorious breath). On Tarotoui, prana is documented among the fundamental spiritual concepts. Simple exercises in heart-rate coherence or belly breathing belong to the same family, even when they are presented in secular terms. Advanced pranayama practice requires guidance, since some intensive techniques can produce hyperventilation or transient disorders.
Going further
The physical existence of prana in the sense of measurable energy is not supported by Western physiology. The concept remains useful as an operational metaphor for respiratory and nervous vitality. Note also that translating prana as energy in the scientific sense is a simplification: prana belongs to a distinct cosmology, with its own axioms. The practice of pranayama can be useful without literally adhering to the underlying metaphysics.