In the compound term "fitness qigong", the words "fitness" and "qigong" are mutually limited. On the one hand, "fitness" modifies "qigong" and defines "qigong" as qigong with fitness purpose and significance. On the other hand, "Qigong" regulates "fitness", defines fitness as fitness in the form of Qigong, and stipulates the basic principles of mutual choice between exercise and Qigong.