The full form of GYM is "Gymnasium". It is a covered location for athletics and is commonly found in athletic and fitness centers, as well as in educational institutions. The word "gymnasium" is derived from the ancient Greek term "gymnasion". In Western countries, "gyms" often describe places with indoor or outdoor courts for basketball, hockey, tennis, boxing or wrestling, and with equipment and machines used for physical development training, or to do exercises. "Gym" is also slang for "fitness centre", which is often an area for indoor recreation.