Coach Trevor Connor and Caley Fretz examine the chemistry that occurs in our muscles while riding and racing. They talk to Dr. I\xf1igo San Mill\xe1n, who is the director of Colorado University\u2019s exercise physiology lab. Best of all, they give you practical advice for your own training to help make that burn go away \u2014 or at least make you faster even if it hurts.\nLearn more about your ad choices. Visit megaphone.fm/adchoices