Sitting picturesquely in the foothills of the hiking and skiing mecca of the Rocky Mountains, Boulder isn't known as America's fittest city for nothing.Intimidatingly hale and hearty, it's a place where bars and restaurants are dead by 9pm so locals can fit in an early morning ski or mountain-bike climb before work.It sits at 5,430ft above sea level so endurance athletes from all over the world come to train here. Boulder's social calendar is packed with a daunting series of strenuous events including an annual 10km road race that attracts 50,000 runners, a plunge into an iced-over lake and a 'Tube To Work Day' in which commuters hurtle down the rapids of a river clinging to car tyre inner tubes.
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