I'm building an app to connect athletes to workout together (http://www.joinapace.com/theapp/, starting with running) and launching in NYC next month. Thought I'd post here and would welcome any feedback.
Something I'd love to hear ideas about would be how to get a large number of users quickly in a dense area. I've heard interest from a lot of runners in the idea of being able to open an app and find someone to run with now, but the concept faces challenges if there aren't others looking for a run in the same area/time/pace/etc.
Appreciate any thoughts.