Besides, some pathological changes of visceral organs are reflected on the sole: there may be a lump or feeling of pain on a certain region.
Sometimes, the sole is called "the second heart".
Answer: Usually, the order is from the head to the foot. But the shanghai massage is the "end of the body," far from the visceral organs, where blood circulation is relatively slow.
Local stagnancy of Qi and blood tends to happen in the foot and affect the general circulation of Qi and blood of the whole body.
Starting from the massage shanghai can give a warming-up effect to the body so that the whole process will go smoothly.