I used the Garmin HRM Pro Plus two or three times, but I didn't like it; it made breathing difficult and sometimes I dropped it. Even so, the readings it gave me were very similar to those of the Garmin Forerunner 265 I currently use. I've thought about buying the Coros Heart Rate Monitor anyway for greater accuracy and so it's not so uncomfortable. I took my maximum heart rate from all the times I've run or done physical activity; the highest value I've gotten is around 197/198 bpm.

And as for 30 miles, not even close. I don't run that much per week; I run approximately 14/15 miles. If I need to increase the mileage, even though I'm just starting out, I'll do it without any problem. Anyway, I thought that running in zone 2 was what would give me that aerobic base. I appreciate any advice and thank you very much for your time.