@lovejustice I think it was Andy Galpin who spoke or wrote a book about HR monitors and gauging intensity, I think part of the understanding is as some have suggested is what other factors were in place that indicates towards zone 2:
- Being able to hold a conversation
- Controlled breathing (possibly nasal breathing only)
- Feeling like you can easily stick to the pace you have chosen for an extended time
- Your HR monitor I agree may be a bit off, I would say the zone 2 it suggests is a lower zone 2, it’s zone 3 is a higher one, generally an idea of are you trying to build aerobic fitness or just move to improve recovery from other workouts?
We lived without heart rate trackers for a long time, people found other ways to understand their training intensities so don’t take HR monitors as the be all and end all!