



Is this normal or is my Forerunner 70 faulty?
I'm a completely new runner and the screenshots are my 3rd and 2nd runs.
During my run today, my heart rate suddenly shot up according to my watch. I didn't feel that bad and thought I could continue for some extra distance if I wanted to.
Exactly one week ago I ran at similar pace and my watch was showing very low heart rate which I thought to be too low. The run last week actually felt harder than today's run.
Is there any explanation for these heart rates?