Shiatsu is based on the understanding that life force energy or ‘chi’ circulates along channels in the body known as meridians.

https://youtu.be/lgS1Ob5vIhE

These channels can become blocked for many reasons, and the flow of energy to organs is restricted. For full health to return the energy must be encouraged to flow.
Shiatsu whilst applying the kidney ginger compress allows the blood and chi to flow into the kidneys restoring their power. The pressure point shiatsu techniques help focus this energy.