I keep trying to reply, would help if I was logged in with the right keys! 🙄

Anyhow, I think that is unique for everyone. For example, my HR never goes past 180-ish, even during really intense exercise, but my resting HR is low, like 40 on average 🤷

I think the general rule is, if you can comfortably hold a conversation (four word sentences), you're probably running at a good speed.