Health trackers offer a ton of data. Here are the metrics doctors want you to pay attention to - vox.com

We’re all wearing health trackers and wearables. Are the heart and health data they’re collecting actually helping us to live longer?

As I am typing this, a device rests on my wrist that purports to unlock a trove of real-time information about my bodys performance. I can click a button and check my heart rate and review how much i…