Ask for directions on the time of piling.
It is best to stand and pile up twice a day. Getting up on an empty stomach in the morning makes people's blood flow easily. Standing for half an hour to forty minutes will refresh you. You can also stand for 40 minutes before meals or 1.5-2 hours after meals. It is best to stand for 40 minutes at a time, which conforms to the principle of human blood circulation.