I am a firm believer in exercise, period. Any kind of movement is great. You get off the couch and you are already a winner.
But just like with anything else in life, you need specific strategies for specific results. You don’t use a hammer to screw a screw into your wall, and you don’t use garlic to make a sweet dessert. That’s just common sense.
Well, it’s the same with exercise. If you want to build muscle, you lift weights. If you are recovering from an injury, you walk and you start slow. If you are train for a marathon, you work on endurance. And if you are looking to burn some fat off of your body, you need to increase the intensity of your workouts. Why is that? Three reasons: (1) you need to increase your caloric expenditure. (2) you need to build muscles in order to rev up your metabolism (3) you want to burn calories even after you are done working out.
Unless you have not worked out at all for a while, slow walking isn’t going to do the trick. So set your mind, research some higher intensity workouts, and go to it!