If you want to automatically copy your activities from Garmin Connect to Strava or RunKeeper, then check out http://garminsync.com. GarminSync allows you to:
- Automatically copy all new activities added to Garmin Connect to Strava (and/or RunKeeper)
- Bulk copy old activities from Garmin Connect to Strava (and/or RunKeeper)
For both you just need to do a one time setup at http://garminsync.com and the rest is automatic.
Regards,
Gero