I have the Forerunner 970. My latest run show Zone 5 as over 136. My maximum Heart rate is 169 so this is obviously absurd. How do I fix this and how did this happen?
I have the Forerunner 970. My latest run show Zone 5 as over 136. My maximum Heart rate is 169 so this is obviously absurd. How do I fix this and how did this happen?