A week into London's 2012 Olympic games, we at Healthy Living are hooked, watching live streams from our desks and re-watching the broadcasts from the couch at night.But while we've been, um, sitting, our favorite athletes have been torching serious calories on their way to the medal stand. Not to state the obvious, but as those flawless abs, strong shoulders and rock-solid thighs illustrate, our Olympians are in tip top shape, blasting thousands and thousands of calories, all in a day's work.