Fitness can certainly play a role in losing weight. It has a certain effect on losing weight. It also consumes excess fat in the body. Weight loss and fitness can be carried out at the same time, but it must be emphasized that one stage should focus on one purpose, first lose weight and then fitness. Otherwise, even if there are good muscle lines, they will be covered with fat and cannot be displayed. Because losing weight and muscle training belong to two different types of exercise. In order to lose weight, aerobic exercise must be carried out, such as jogging, swimming, skipping rope and cycling. Muscle training is mainly based on "anaerobic exercise", such as barbells, dumbbells and strength equipment. When doing strength exercises, dieters will find that their body shape has changed. If you simply do aerobic exercise, the body shape of the dieter will not change much. Generally speaking, obese people can be divided into two types: apple type and pear type. Losing weight only through aerobic exercise will only make their bodies change from big apples to small apples and from big pears to small pears. A dieter's body will tighten after strength training. Because when fat decreases and muscle increases, the proportion of muscle fat in the body changes. The volume ratio of muscle to fat is 1 3. So when the volume ratio of body muscle to fat changes, the body shape changes.