Not sure how it works but that look promising:
http://developer.garmin.com/garmin-connect-api/overview/
"Near real-time data pushed directly to developer server"
That's marketing speak, no? As far as I know, and I've not looked into this in detail, but I work in this field, you can't upload an ongoing activity to the server. You have to wait until the activity is finished before you upload it.
@santino started
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Not sure how it works but that look promising:
http://developer.garmin.com/garmin-connect-api/overview/
"Near real-time data pushed directly to developer server"