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A gym, short for gymnasium, is an open air or covered location for gymnastics, athletics, and gymnastic services. The word is derived from the ancient Greek gymnasium.[1] They are commonly found in athletic and fitness centers, and as activity and learning spaces in educational institutions. "Gym" is also slang for "fitness center", which is often an indoor facility.

Gymnasia apparatus such as bar-bells, parallel bars, jumping board, running path, tennis-balls, cricket field, fencing area, and so forth are used as exercises. In safe weather, outdoor locations are the most conducive to health.[2] Gyms were popular in ancient Greece. Their curricula included Gymnastica militaria or self-defense, gymnastica medica, or physical therapy to help the sick and injured, and gymnastica athletica for physical fitness and sports, from boxing to dance.