"The tipping point is that magic moment when an idea, trend, or social behavior crosses a threshold, tips, and spreads like wildfire".  Malcolm Gladwell's best-selling book published in 2000, "The Tipping Point: How Little Things Can Make a Big Difference"  can translate in to our sport.  Andy Jones-Wilkins and Zach Bitter join The Nation to discuss what some of these little things are and some of the people that have been influential in making trail and ultra running more popular.