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Extreme obstacle races have been all the rage since TV shows like "Ninja Warrior". More and more men and women are pushing their bodies to the limit, seeking happiness in the process. The most popular race is probably the "Tough Mudder" with 2.5 million participants worldwide. The almost 20-kilometer-long off-road course leads through mud and icy water. Anyone who wants to take part in this race needs not only muscles and stamina, but also a lot of skill and meticulous preparation. The toughest amateur athletes train almost every day and have set up their own practice courses at home.