Although physical activity increases the metabolic rate and helps to burn calories, the truth is that food also plays a crucial role in this process. To lose weight, you need to create a calorie deficit, i.e., burn more calories than you consume. There's no point in compensating for an inadequate diet with exercise, so, for effective results, it is essential to combine exercise with a balanced diet. Although it is possible to lose weight without exercise, it's easier to maintain the weight you've lost with a routine of physical activity. The combination of strength training and aerobic exercise, performed regularly, will improve your fitness and preserve muscle mass. That's why the secret to successful weight loss is to integrate exercise and a healthy diet in order to create habits for a better life.