The word qi (氣) is one of the oldest and most central concepts in Chinese wellness traditions. In classical texts it is described as a kind of vital energy or life force that flows through the body and the natural world.
What classical texts say
Early medical and philosophical works, including the Huangdi Neijing (Yellow Emperor's Inner Classic), describe qi as the substance that animates the body, powers movement, digestion and thought, and connects people to the rhythms of the seasons.
Traditional view
Traditionally, good health was described as a state of abundant, smoothly flowing qi, while illness was framed as qi that was deficient, blocked, or flowing in the wrong direction.
How modern readers can approach it
Modern readers can treat qi as a useful traditional framework for talking about breath, posture, relaxation and daily energy. It is a historical and cultural concept, not a measurable substance, and nothing in this article is medical advice.
Where to go next
Breathing and gentle movement practices such as Ba Duan Jin were designed around this traditional idea. See our articles on movement and breathing for practical, beginner-friendly introductions.