Fitness is different from dieting to lose weight. Dieting to lose weight is not good for your health, and if girls have sagging breasts and loose skin, they may suffer from malnutrition and poor hair quality. Fitness and eating nutritious food can build beautiful muscles. Now she has abdominal muscles and back muscles, but don't exercise too much. Remember to relax her muscles after exercise, otherwise it will be too big and may be uncoordinated.