It means to issue or discharge power explosively or refining the explosive power, and is not specific to any particular striking method. With this definition in mind, a boxer is also capable of the same. However, in the context of internal martial arts, this process commonly seen as a set of methods capable of generating the energy further refined and focused through many more muscle groups (particularly in the waist and torso - the dantian) allowing feats with far less visual physical expression such as the one-inch punch. Jìn (勁), or "power", is often confused by Westerners with the related concept of jīng (精), which literally means "essence."