Do you still remember the classic slogan: "Hold your head up, chest up and abdomen in." You can look in the mirror and say, "Hold your head up, chest up and abdomen in." Will the swan neck come out after these three steps are completed? In fact, the so-called swan neck is "looking up", with its head upright and its neck elongated. "Chest out", no hunchback. "abdomen", on the one hand, put away the lower abdomen, more beautiful; On the other hand, adjust the posture of the waist to avoid lifting the chest and making the waist quite sore. What physical exercise? Stand against the wall for half an hour every day. Personally, I find it troublesome, tedious and time-consuming. And slow, easy to rebound.