There are a few ancient threads around here from a decade ago with people trying to convert GPX to FIT which the Garmin SDK doesn't do natively
But I've never found a free utility, open-source or otherwise which can do robust GPX to FIT conversion?
Does such a creature exist?
Note I do not mean just courses/routes, I mean full blown activity conversion with GPX extensions for heartrate,cadence,power, etc.
There's a web tool at GOTOES "strava tools" which will do it but they moved the FIT option behind a paywall, probably because it was the only one that worked well
In all of github no-one has done this?
I guess one SDK option would be GPX to Garmin CSV conversion and then CSV conversion to FIT
If I cannot find anyone who has already done the hard work, I may just write that method myself I guess?
Seems wild in 2026, have to be re-inventing the wheel, maybe I am just not searching good enough
