A new series published today in the venerable journal Lancet looks at the realities of exercise on the dawn of the Olympics. Not only are Americans woefully inactive, but the rest of the world is following suit. It's bad enough that almost 1/3rd of the world's adults are considered "completely sedentary" (that's 1.5 billion adults who move less than 20 minutes per day!). But perhaps worse is that this pattern starts young, with 80% of all teenagers failing to get the minimum recommended 60 minutes of exercise per day. The authors conclude that inactivity is just as dangerous as smoking, and they calculate than more than 5 million people die every year simply because they don't move enough. The bright side? This one is easy to fix. Get up already!