In this episode we take a deep dive into a subject that Case knows well, and that our guest, Lennard Zinn, has lived for the last five years: Heart arrhythmias in endurance athletes. Chris and Lennard, along with Dr. John Mandrola, wrote a book entitled \u201cThe Haywire Heart\u201d that details how and why long-term endurance exercise could cause a variety of heart arrhythmias. We\u2019ll also hear from Jeremy Powers, who dealt with his own heart arrhythmia this past cyclocross season.\nLearn more about your ad choices. Visit megaphone.fm/adchoices