Thirteen stairs down from my Venice Beach apartment. Every single time, without thinking. I don't even know when it started.

Counting steps is easy using a phone, a wearable or a fitness tracker. And scientists have lots of data to figure out how many daily steps you... Counting steps for health? Here's how many you really ...

From pricey wearable devices to your phone, it has never been easier to track your daily physical activity, or lack of it. And if you're like many Americans — and spend 9-plus hours sitting everyday — ...