Ключевые слова: 1, 2017, adult, asphalt, athlete, athletic, athletics, body, caucasian, competition, competitive, endurance, exercise, feet, foot, forest, half, jogging, leg, male, man, marathon, nature, one, outdoor, park, part, people, race, real, rivalry, road, run, runner, running, shoes, sport, sportswear, spring, track, trail, woods, young,