From WellandGood.com…..
Grab your mask and walk into any gym and you’re bound to see two cardio machines getting a lot of use: the elliptical and the treadmill. At some gyms, both pieces of workout equipment are so popular that there’s a sign-up list for each. But it begs the question: In the head-to-head battle of elliptical vs. running, which is the most effective workout?