Melissa Barker fell in love with grueling sport of cyclocross, and now the high school science teacher in Colorado is a national champion

Melissa Barker grew up doing almost every sport possible, but in college discovered that cycling was her true calling. Now the science teacher in Colorado has become a national champion in cyclocross, a grueling sport that combines mountain biking with cross-country, obstacle-course type running. My story on Barker for ESPNW.com's Weekend Warrior series: http://espn.go.com/espnw/life-style/article/15906779/weekend-warriors-science-teacher-became-national-cyclocross-champion