I think it is. I wouldn't say it is exploding in popularity however there is a growing contingent of people that like long race. The market has been expanding to meet that need. I only have experience in Michigan. Here we have an endurance series (6/12hr), 3x 100 mile races and ~6 Marathon (30-50 mile) races. It has grown over the last 5 years quite quickly. I hear of more people traveling to NUE races as well.