Ключевые слова: active, activity, background, ball, basket, basket of tennis balls, blue, box, bright, competition, concept, court, daytime, double, empty, equipment, fitness, game, green, grid, hall, healthy lifestyle, hobby, individual, indoor, inside, involved, large, leisure, light, net, object, play, preparation, prepared, racket, racket sport, recreation, serve, several, sport, sporty, tennis, tennis ball, tennis court, tennis grid, tennisball, train, training, yellow,