Calisthenics are ancient Greek exercises that use only bodyweight for resistance. Common calisthenic movements include pulling, pushing, bending, jumping, and swinging. Practicing calisthenics can increase strength, fitness, flexibility, and improve muscular and aerobic conditioning as well as psychomotor skills like balance, agility, and coordination. Street workout combines sports, athletics, and calisthenics by using objects like railings and playground equipment outdoors. The World Street Workout & Calisthenics Federation oversees international competitions including an annual freestyle calisthenics world cup.