Ключевые слова: angle, athletic, championship, competition, cushioned, digits, diminish, exercise, field, fitness, health, healthy, intersect, jog, jump, line, marking, number, numbers, olympia, outdoor, parallel, people, perspective, practice, recycled, rubber, rubberized, run, soft, sponge, sport, sports, sprint, stadium, start, surface, track, training, urethane,