Here's exactly what you're working when you hit the bar to do one of the most comprehensive upper body exercises.

You probably know zero exercise is not enough and that going for a walk every day is generally a good thing. And if you’re training for a marathon, you’ll be on your feet for a couple hours of hard ...

As a general rule, regular running promotes better sleep. But there appears to be an exception: hard exercise in the hours before bedtime. That’s the conclusion of a new study in the journal Nature ...