Kung Fu is Chinese martial arts originated at the Shaolin Temple there is some evidence to suggest that the Chinese martial arts were well developed before the Shaolin Temple was built. The temple was built in the third century A.D. but there are references to such individuals as the physician Hwa Tuo who was using exercises based on animal movements to improve the physical health of his patients well before that date.
In modern times, it develops well and becomes not just martial skills or physical movement. It is also a way for keeping fit, entertainment, and performance.