Ключевые слова: activity, area, athlete, athletic, background, baseball, cheerful, competition, concept, concepts, contemporary, contest, course, empty, event, exercise, fast, field, football, grass, green, ground, healthy, lane, lanes, life, line, living, modern, natural, nature, nobody, number, one, pattern, physical, race, racetrack, red, run, sport, sprinting, stadium, start, striped, surface, track, white, win,