In this interview, Dr. Derek Crinion and Dr. Adrian Baranchuk discuss atrial fibrillation in the "older" athlete. They define what is meant by older when it comes to the heart and they discuss why and how too little or too much exercise can increase risk of atrial fibrillation. Dr. Derek Crinion is an electrophysiology fellow at Kingston Health Sciences Center in Kingston, Ontario.Dr. Adrian Baranchuk is a cardiologist-electrophysiologist at Kingston Health Sciences Center and professor of medicine at Queen's University. He is also editor-in-chief of the Journal of Electrocardiology.The practice article they co-authored is published in CMAJ: www.cmaj.ca/lookup/doi/10.1503/cmaj.191209Podcast transcript: https://www.cmaj.ca/transcript-191209-----------------------------------This episode is brought to you by RepHresh Pro-B. RepHresh Pro-B is a vaginal probiotic clinically shown to balance yeast and bacteria.Visit http://bit.ly/RepHresh for more information.-----------------------------------Subscribe to CMAJ Podcasts on Apple Podcasts or your favourite podcast app. You can also follow us directly on our SoundCloud page or you can visit www.cmaj.ca/page/multimedia/podcasts.