Burning calories through physical activity is essential to weight loss. If you don’t burn more calories than you eat, you won’t lose weight. People think they’re too busy to walk 20 minutes a day or do a little weight training or ride a bike, and then they wonder why they can’t lose weight. If you try to diet without exercise, it just takes that much more effort. Any physical activity, even long walks, will help. Light intensity exercise and activity is also less likely to elevate hunger levels, so go ahead – sneak a session or two in every day.