If you have lost a lot of weight on the treadmill or in aerobic classes and it isn’t working any more, it’s because your body has gotten used to the intensity of the exercise and is no longer burning fat as efficiently. Our first instinct is usually to increase the intensity of the workout, but your body will still resist. The best approach is to change your exercise venue. For example, trade the treadmill for walking or jogging outside. This will wake your body up, get your heart going, and burn more fat because your body isn’t used to the ever-changing terrain of the great outdoors.