Part 3/8:
Looking back at the data from the Coros Training Hub, I found that I began my 5K runs with an average pace of 6 minutes 13 seconds per kilometer (10 min/mile) at an average heart rate of 137 beats per minute. By day 30, my average pace had improved to 5 minutes 36 seconds per kilometer (9 min/mile), with my heart rate dropping slightly to 134 beats per minute. This illustrated a clear benefit of increased speed for a comparable effort.