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Thanks. I think I have a Forerunner 235 so too old too.
Praps I’ll treat myself to an upgrade. I like the idea of a simple measure.
Hefty-
You don't need to buy a new Garmin to get graphs, if it helps.
You could use the Visible app, which is designed for people with long covid, but uses pretty basic HRV algorithm.
If you're not into using something explicitly for sick people, you could also use an app like HRV4Training which does the same thing but also connects to Strava. There's also EliteHRV, which is what Visible uses under the hood.
They're all free, and they all give you a daily "how fucked are you today then, fam?" score, plus graphs and other useful bits and pieces.
I also have a garmin with body battery functionality, but I find the HRV tracking more useful day-to-day (I have a long-term illness). Here's links to screenshots of today's scores from HRV4Training and for Visible for your interest - the recorded numbers aren't quite the same, but they're testing at different times, and are better for looking at overall trends anyway. HRV4Training has more historic data for me than Visible, which might also be a factor.
(edit: moved the inline attachments to imgur coz they massive innit)
bothwell
I believe it's Garmin Body Battery. Needs a newish Garmin watch, newer than mine :(
https://www.garmin.com/en-GB/garmin-technology/health-science/body-battery/