Kung Fu classes explained...

Chinese martial arts, also referred to by the Mandarin Chinese term wushu and popularly as kung fu are a number of fighting styles that have developed over the centuries in China.

In Chinese, kung fu can also be used in contexts completely unrelated to martial arts, and refers colloquially to any individual accomplishment or skill cultivated through long and hard work. Wushu is a more precise term for general martial activities.

Explanation supplied courtesy of http://en.wikipedia.org/