The principle of losing weight is to make the body burn more calories, so that the heat output is greater than the input. You can do high-intensity exercise for a certain muscle group for a certain period of time. But the energy consumption of weightlifting is actually relatively low, especially for beginners or purely recreational exercises, which use very light dumbbells. On the contrary, if you spend the same time doing aerobic exercise, you will burn twice as many calories as weightlifting. In fact, this is just a beautiful lie. The head coach of American Sports Medical University made a survey on exercise and weight loss, and found that resistance training is a good way to train muscles and exercise strength, but no one found that muscle exercise can promote weight loss.