Runners' Highs Evolved to Make Us Better Hunter Gatherers [Exercise]

Runners' Highs Evolved to Make Us Better Hunter Gatherers [Exercise]:

You've all been there: tired and exhausted, you drag your ass out for a run, but a few miles in—BOOM—your pain fades and you're suddenly euphoric. You've got a runner's high—and new research reveals that it's an evolutionary trait that fine-tuned us to be the ultimate hunter-gatherers. More »