Don't care too much about this. Generally, beginners will have a little bit of muscle tension caused by incorrect posture. So it feels different. Although your neck muscles are very painful, your abdominal muscles are still exerting strength, but the neck muscles are not as big as the abdominal muscles, so you feel the pain first. Then you won't feel abdominal muscle pain. I'll teach you a trick. Abdomen in. Lie flat. Feet are naturally 90 degrees, hands on both sides of your head, not behind your head. Whether you can afford it or not. Keep your head at 90 degrees to your body, that is, keep your eyes level. Then exhale slowly and stand up with the strength of abdominal muscles. Think with your head. It is your abdominal muscles that exert strength. You can feel it slowly at first. Don't leave your waist and spine on the ground. Your body rolls up like a hedgehog until it can't roll any more. Then exhale slowly and return to the original position. It's best to keep your head and shoulders away from the ground, so that you will feel irritable in your abdominal muscles after about 20 times. . . That's so cool. Once every 2 days, 5 groups each time, 20 times in each group. Remember to stretch to protect your stomach after you finish, and add it after a long time. This is to practice the abdominal muscles in the upper navel and lift the legs in the lower abdomen.