Second, you should reduce the intake of protein. From the point of view, you should help yourself to lose a muscle, at least you can't help your body absorb protein in food excessively, which is not good for muscle loss. You need to reduce the intake of egg yolk, beef and protein powder, or stop eating them. You can maintain the remaining muscles through normal muscle training without raising your standards.
Third, the back needs less exercise or training in the corners of the back. Strengthening the exercise around you can help your back relax more. You need to exercise your abdomen, sides and chest, and even increase your self-cultivation in the amount of exercise. Lying on the front side can help your back muscles weaken, reduce your time to some extent, and help your back muscles decrease.
Fourth, after subtracting the muscles of the back, the muscles of the body still have a movement inertia. If the previous method or a little improvement is useless in muscle growth, you need to change a way of exercise, and in the early stage of exercise, you must be fast, so that your body can directly and forcibly change the muscle shape while the memory is still there.