It has something to do with their muscle fat ratio. Muscle is a manifestation of a firmer protein or fat, which can store energy and then have more room for strength. However, muscles are not naturally perfect muscles, but need the stimulation of acquired strength. Our muscle groups feel that the existing strength is not enough to meet the needs of daily activities, and will continue to develop after being stimulated by external forces, and then form muscles, and the muscles become thinner and thinner.
It has a certain relationship with their bone density, which is influenced by personal physical exercise. Fitness has a certain effect on improving bone mineral density, but it is more in some aerobic sports, such as long-distance running, playing basketball and football. These physical activities will make the bones of the body bear more strength and subconsciously promote the development of the bones of the body. The body's bone density is greater, and it will naturally appear heavier under the same volume.
Proper physical exercise can make us have better external value, because our face shape may not be changed in a short time, but a person's fat and thin can be changed. As long as you keep exercising, you can make your body's muscles more evenly distributed and your body shape more perfect, and naturally you will have better external performance. The end result is light weight, but it looks strong and not so fat and bloated.