I hate to exercise. I'd rather knit. Or read. Or sleep. Or eat (although that's what got me in this mess to begin with). I know that when I do exercise, I feel better. And it's easier to lose weight. But I am not one of those people who obsesses about leg day at the gym. I don't train for half marathons or sign up for century bike rides or get up at 5 a.m. several days a week for spin class (I did do that long ago and enjoyed it. I guess.). The Fitbit activity tracker helps. I'm still not one to go for a walk around the block at 11 p.m. to get my last minutes in. I do, weirdly, enjoy the watch's little vibration and accompanying fireworks graphics when I hit a certain number of exercise minutes for the week or 10,000 steps in a day (which does not happen as often as it should). A new study just out , though, shows that exercise is as important as weight loss to getting that fat gone from my liver. Maybe even more important. Exercise training can lead to a sig...