I’ve been wondering why you can’t connect to other runners. Taking a morning run in Chicago, why not race someone taking an evening run in Tokyo? Why not chat with your friend? To simulate actually running together, the smalltalk could fade out the more the listener’s speed deviates from the talker’s.
Not in the same shape? Handicaps, like in golf. Prefer not to talk? Listen to the same music.
You can choose between party mode – talk to all available friends, automatically connecting to the highest ranked friend online, or connecting manually.