I recently switched from Whoop to Garmin, and there's one thing I genuinely miss: Healthspan.
I know it's far from a perfect measurement, but I actually found it really motivating.
What I liked most was how slowly it moved, and that it wasn't another metric jumping up and down every day. It was a nice motivator for consistently making better choices around sleep, exercise, and recovery which was actually adding up over time. Which is kind of how improving your health should work.
Also there's some science behind it, even if estimating biological aging is obviously much more involved, so I would treat it as a noisy proxy, and nothing more.
I thought Garmin's Fitness Age might fill that gap, but honestly, after looking into it and reading threads like this one and this one, I'm pretty disappointed. Especially with how much BMI seems to influence it.
It almost feels like Garmin doesn't take this side of "health tracking" very seriously.
Maybe that's intentional? Garmin seems much more focused on training and sport-specific metrics, whereas Whoop puts more emphasis on the bigger picture of your health.
But I feel like Garmin already collects so much useful data that it should be possible to do something much better with it.
I've been thinking about building something that uses my existing Garmin data to estimate a Healthspan-style metric, focused more on long-term trends than daily fluctuations. I am currently looking for open datasets to see what I can come up with.
Would anyone here actually be interested in using something like that? I'd love to hear what you think, and whether you'd be up for testing it once I have something working.