On this point, I just got a Withings Steel HR [1]: It's a classic analog watch, with a sole extra function of measuring heartbeat and exercise on a tiny LCD in the back of the watch face.
I love that it's purpose-specific and isn't gimmicky like smartwatches. This also means the battery lasts about a month. Plus, it looks good.
[1] https://www.withings.com/ca/en/steel-hr