In Gymnasiums, apparatus such as barbells, bumper plates, kettlebells, dumbbells, resistance bands, jumping boards, running paths, tennis balls, cricket fields, and fencing areas are used for exercises. Outdoor settings are healthiest when the weather is safe.[2] Gyms were popular in ancient Greece. Their curricula included self-defense, gymnastics medica, or physical therapy to help the sick and injured, and for physical fitness and sports, from boxing to dancing to skipping rope.