How does strava get elevation data with apple watch?

So other than the fear of getting a flat with nothing on me while I ride, I love that I can go for a ride without bringing my phone and just using my Apple watch series 2.  I've heard many things about how the watch doesn't and does have a barometer so I was wondering if Strava is gathering altitude data?


After my ride and it uploads to Strava on my phone, it shows the elevation changes through out the ride.  I was just wondering if it strava putting the data in from other peoples rides or actually recording on my watch and uploading the data?





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