9 min read FITNESS TRACKERS HAVE become more sophisticated than ever, but they’re also getting a bit complicated. There are more sensors, more notifications, more monthly payments, and more data to make sense of, so it can be a mental workout just to keep up. Google has aimed to simplify that with the new Fitbit Air . At $99 with no required subscription, it’s a tiny, screenless band that tracks your heart rate, sleep, steps, and workouts without demanding much of your attention. You put it on, and it gets to work. Everything lives on your phone, inside Google’s new Health app, where you can check in when you feel like it. I’ve spent the past few weeks wearing the Fitbit Air through the daily rhythms of my actual life, including inconsistent sleep, sporadic workouts, and fighting against my weakness for sweets. By now, the Google Health app has gotten pretty good at logging Ghirardelli mini chocolates (more on that later).…