Most runners dread training for races on treadmills. This Denver couple would rather do it indoors.

Most runners dread training for races on treadmills. This Denver couple would rather do it indoors.

Many runners revile training on treadmills so much they curse them as “dreadmills,” resorting to their grinding monotony only when it’s too cold, hot, snowy or rainy to brave the elements outside.

Many runners revile training on treadmills so much they curse them as “dreadmills,” resorting to their grinding monotony only when it’s too cold, hot, snowy or rainy to brave the elements outside.