Let me get this out of the way: treadmill running is better than sitting on the couch reading blogs that outline the reasons running outside is better than running on a treadmill. If it’s your only option – or even just the way you prefer to exercise — have at it. You have my blessing. The best exercise is the one you’ll do, remember. But there are limitations, risks, and biomechanical changes that occur when treadmill running. It’s not the same as running outside, and there’s evidence to suggest it might be worse in some respects. So let’s explore the potential problems associated with treadmill running.

(This Mark's Daily Apple article was written by Mark Sisson, and is narrated by Brock Armstrong)