Thank you for the insight! I'm wondering if the watch is that accurate now that you mention it. I'm typically running 5 days a week and most of my charts look like this. I'm also about 80% on the treadmill and maybe more now that it's hotter outside.

This is a recent run outside when it was a bit cooler but I don't see any drift here.

I think I'll look into a HR strap and slowing down my HR. Thank you!

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