Anyone who's ever set a goal knows how far the target can move as things change. In a marathon, a pace adjustment of 2 seconds per mile translates to almost a minute in total time—when you're trying to qualify for Boston or New York, that minute is a huge deal. Pace focuses on quick input and feedback so runners can prepare for a multitude of scenarios and feel confident when they're on the course and real life rushes in. A flick of the thumb instantly updates your goal and generates a list of splits in your preferred units. It's an obsessive runner's dream.