There are 3 components to weight loss and they are weight lifting, cardio, and healthy eating. Weight lifting builds and maintains muscle. Now building and maintaining muscle is important because it increases your basal metabolism which means you burn more calories even when you are resting. Cardiovascular activities when done consistently say for 30 minutes or more in the aerobic zone are very effective in burning body fat. Healthy eating is important because it is impossible to do enough exercise to offset a poor diet.