Strava has created THE unifying platform upon which cyclists share their rides, amassing tens of millions of users, and creating a massive platform of paid subscribers and valuable data. They did this by making it device agnostic, gamifying the experience, and making it incredibly easy to use. The result? A service that's able to push more services and products to their customers, sell aggregated data to municipalities, and attract massive venture capital. Here, co-founder Mark Gainey shares their startup story and growth tactics.