Ключевые слова: activity, artificial, athlete, backgrounds, beginnings, bright, championship, competition, competitive, concept, concepts, cultures, curve, dividing, empty, end, event, exercise, exercising, field, finishing, flooring, forward, image, jogging, level, line, material, new, no, outdoors, playing, race, red, road, rubber, running, single, sport, sports, sprinting, stadium, street, striped, success, surface, technique, textured, touching, vanishing, way,