Anyone curious about running by heart rate—and wondering what the numbers really mean—need to listen to this episode. The host duo answers Jennifer’s HR question, plus her query about why the first mile of a run is often the toughest. Then they turn to Sandy’s query about weighted vests, with Dimity summing it up best: “If you want to turn a walk into more of a workout, wear a weighted vest.” Before the first Q+A around   When you shop our sponsors, you help AMR.We appreciate your—and their—support! Feel the Currex difference: Get 15% off with code AMR15 at Currex.com Use code INF-AMR to get a gift card good for your next purchase at Selkirk.com  Learn more about your ad choices. Visit megaphone.fm/adchoices