Fa jin, fajin, or fa chin (fā jìn, 發勁) is a term used in some Chinese martial arts, particularly the neijia (internal) martial arts, such as Xingyiquan, T'ai chi ch'uan (Taijiquan), Baguazhang, Bak Mei and Bajiquan. It means to issue or discharge power explosively or refining the explosive power, and is not specific to any particular striking method. Jìn (勁), or "power", is often confused by Westerners with the related concept of jīng (精), which literally means "essence." To generate the fa jin it is necessary to create a spiral from Dantian towards the limb or body part (e.g. shoulder, head, hip) that will perform the technique with explosive force (Bàofālì 爆發力). Jin describes the ability to generate force. If a person is off balance, they have no jin. The way it is explained is that the qi cannot penetrate the muscle to produce force. From a biomechanics perspective, the person in a weak physical state. Jin and qi are inherently combined.

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