I'm trying to get a team together to do something similar which you can join if you're interested: https://dougs-digital-garden.netlify.app/notes/trailsapp/
This sounds like a pretty awesome idea.
I use Strava, and overall I am happy with it but for the lack of one feature that really bugs me - it has no option to set it up to do a one button start. Currently to record a ride or other activity I have to press record, then press Start - which doesnt always start recording.
Having the ability to set your app to do one touch activity recording would be a feature Strave does not have and therefore an advantage
There may be no direct 1:1 solution at this time, but you can do a lot with IFTTT and Webhooks. So long as your fitness tracker's host service (Apple, Fitbit, etc.) supports IFTTT, you could -- for example -- send a post to Mastodon with whatever information you desired. I do something similar with Untappd since there's no direct integration with Masto at this time.
EDIT: I believe these are the guidelines I used to figure out my own integration. https://hyperborea.org/journal/2017/12/mastodon-ifttt/
Interesting, I might do something similar with HomeAssistant or NodeRed
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