Ключевые слова: action, activity, athlete, biddinghuizen, boy, challenge, charity, child, children, closeup, competition, competitive, contest, dirt, dirty, effort, endurance, endure, event, exercise, extreme, female, fitness, flevoland, healthy, leisure, man, mud, mud race, muddy, mudrace, mudraise, netherlands, obstacle, obstacle run, outdoor, outdoors, parkour, participant, passion, play, playing, race, run, runner, splash, sports, training, water, wet,