Meridians, are energy pathways/vessels in the body. It is a bioenergy network in our system- transforming, transfering qi/prana/life force energy, just like our arteries, carrying blood.
This pathway can be disturbed, blocked, due to emotional, mental, physical stress and traumas. Rebalancing the meridian chanels helps to revitalise your body and mind.
There are many ways to do that. Muscle testing is a common one, non invasive and can be done in fully clothing.
Each muscle is related to a meridian in our body. If the muscle tests weak to certain pressure, that shows the related meridian is out of balance...