In the United States, 21% of adults use a smartwatch or fitness tracker. That’s roughly 70 million people. Now I won’t get into the fact that most of these people have higher levels of education and are higher up the socioeconomic ladder. That’s a story for another day. My focus today is on the technology being used and the fact that millions of people in the US alone have the capability of tracking many basic health behaviors and health metrics. Activity and stress levels, amount of sleep, and heart rate are among the most common. If you add to this the