Ключевые слова: abstract, action, activity, arena, athletic, background, ball, blue, challenge, championship, club, competition, competitive, court, equipment, event, exercise, fitness, floor, game, grid, health, hobby, horizontal, individual, indoor, leisure, leisure activity, lifestyle, line, match, middle, net, no people, open, paddle, perspective, play, player, practice, professional, score, serve, service, set, sport, stadium, tennis, tournament, training,