Fitness Whether fat or thin, everyone should exercise. As you said, you are thin. I suggest you do more strength exercises, such as equipment exercises (dumbbells, barbells, comprehensive equipment, etc. ), this will not only strengthen your strength, but also increase your muscles. With strong muscles, you won't be "thin". To do this exercise, you should eat more protein and crude fiber in your diet, and if necessary, add meals to supplement your physical exertion. Wish you success!