Maybe it’s because your stationary bike has morphed into a clothesline or because the only time you break a sweat is while eating jalapeno poppers, but you’ve decided it’s time to start a fitness routine. “Getting yourself in motion is the hardest part,” says Jessica Smith, certified wellness coach, personal trainer and creator of Livinginthin.com, a Web site about nutrition and fitness. But don’t let that deter you. Once you get moving, you‘ll experience just how good it feels to exercise, and the momentum will keep you going. Here’s how to ease into an exercise program that you can stick to—and enjoy—for life.