Generally speaking, fat is difficult to be converted into muscle, unless the body's heat is not enough to maintain the energy needed by the body, fat will be consumed.

It is wrong for people to think that they have no muscles, but they can only say that they are underdeveloped. You say that you do have muscles because your original muscles are not obvious enough, which is normal for people who don't engage in sports or don't often take part in physical exercise. Taking part in physical exercise suddenly will increase the size of your muscle cells, which will make your muscles stronger and even more developed. These substances are all ingested from food in daily life. Finally, strong muscles are wrapped in a layer of fat.