'Add Others' to activity and get different distance / speed off my data, how ?
I run with a friend who has no GPS device so after an activity I add them via Strava 'Add Others' to the run. To be clear this is the only source of data so Strava is sharing my data with them.
Every time I do this on my friends account Strava shows they ran further and faster! How does this work given the single source of date shared ?