The Fitbit Air is a comprehensive fitness tracker that offers a range of features, including heart rate variability, sleep stages, and cardio load. While the Google Health app has some kinks to work out, the AI coach can be useful if used properly. The device itself is great, with excellent battery life and a comfortable design. However, the proprietary charger is a drawback. Overall, the Fitbit Air is a solid choice for those looking for a smart fitness tracker. Why it matters: The rise of AI-powered health coaching raises important questions about the future of consumer healthcare and how technology can support our well-being.