http://www.ultrarunning.com/featured/coping-with-altitude/?utm_source=Weekly+Newsletter&utm_campaign=24299734ac-Weekly+Newsletter&utm_medium=email&utm_term=0_1577fa00f6-24299734ac-96635349 http://www.outsideonline.com/fitness/bodywork/the-fit-list/How-Far-Fitness-Has-Fallen.html http://www.fitsugar.com/How-Improve-Running-Form-34028645 http://climbers.net/race/Western-States-2012 http://www.irunfar.com/2014/05/your-ultra-training-bag-of-tricks-become-a-student-of-the-sport.html http://espn.go.com/sports/endurance/story/_/id/10870741/endurance-sports-grand-canyon-runs-beautiful-spiritual-problematic http://m.runnersworld.com/trail-racing/returning-joy-to-leadville