Mark Gainey, co-founder of Strava, explains how the 'inch wide, mile deep' strategy helped Strava find its niche in the market. Gainey discusses the importance of focusing on passionate road cyclists, building a niche brand, and expanding globally through product design changes and community integration. He also explores Strava's business model, addressing challenges such as lawsuits and military base accusations. Lastly, he analyzes Strava's subscriber rate and future plans for increasing subscribers.