Any fitness requires physical training, but the effect of fitness is different according to everyone's body shape. For example, a fat man can become O 'Neill after exercise. He is a little fat, because there is too much subcutaneous fat to practice, but the subcutaneous muscles have been practiced, and his strength is not as small as that of people with large muscles. When thin people exercise, unless a professional teacher teaches you to give guidance in diet, sleep, medicine and so on. In this way, you can gain weight without affecting your fitness, otherwise your figure will still be small, because there is less body fat and the area of fat-converted muscle after fitness is small. The result is obvious muscles, but it will not increase the overall area, such as Jet Li.