This shows that the basic essentials of standing piles are correct. Exhaust when standing piles is called "empty ceremony" in practice, which is the performance of sinking abdomen. Abdominal distension is normal, but when standing piles, you didn't do it according to the requirements of standing piles from beginning to end, sometimes it was good or bad, sometimes it was wrong. When standing a pile, you should adjust your body, breathing and heart to the end. When you have a stomachache, it is best to use "abdominal breathing", insist on relaxing all over, and then experience it after "empty ceremony". Over time, it will come naturally.