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Even those who love to run sometimes find the activity a tad too repetitive: Lift the left foot, take a step forward. Lift the right, step forward. On and on. Wouldn’t it be more exciting if you were wearing butterfly wings, or covered in foam or chased by monsters? Lots of runners think so, which is why themed races proliferate. They’re especially popular with the 5K crowd; the magic of a costume wears off well before the 26 mile mark for the true marathoner.