Before going to bed every night, put your hands 45 feet away from you, stand up straight, put your legs together, stand with your feet spread apart, tighten your knees and tighten your hips, so that you can feel your two ass eggs in it. If you stand for twenty or thirty minutes, your hips will stick tightly for a long time, and you won't sag. I used to practice dancing, and we practiced it every day. I don't practice now, but I will stick to it at night. But you can sit in the office and stand up and hold the table when no one is around!
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