Alternative Fitness Trends

As I wait at an airport after the New Orleans Marathon, and prepare to return to New York, where I will go to a Crossfit class tomorrow, I wonder. Are there any fitness trends that showed up "late," or anything which could have taken off earlier?

For instance, marathons. In a way it seems like they'd be a mass sporting event that goes well with fascism. Everyone trains for a huge race, and there are Hitler Youth bands the entire course, pumping out patriotic songs.
 
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