Traditional Chinese Medicine (TCM): In TCM, health is seen as a balance. `正气` is the body's innate, healthy, and defensive energy. It is the force that protects you from illness. Illness occurs when “evil qi” or pathogenic factors, known as
`邪气 (xiéqì)`, overwhelm your `正气`. Therefore, maintaining and strengthening one's `zhèngqì` through proper diet, exercise, and a balanced lifestyle is the key to preventing disease.