m600-tempo-hr

Polar M600 – Tempo Run

After yesterday’s relative walk-in-the-park, today was a chance for a run-in-the-park. I took the M600 out for a demanding threshold run of about 90 minutes with 10 minutes warmup. You can see the HR performance against a STRYD HRM pod (Red) on a Garmin HRM4 strap (recorded by a 920XT). Bizarrely the optical M600 (Blue) would be considered to have…