Reflexology
is the manipulation and clearing of Qi energy by means of accessing certain areas of the body. The most common area is through the feet, although some practitioners may work on the hands, ears, or tongue.
The theory behind this work lies in the belief of the "microcosm and macrocosm," which means that everything in the universe is holographic in nature and that all energy is connected. Therefore, you can work on a particular area of the body and create a release of stagnant Qi or Chi elsewhere.
Although this work has not been scientifically validated yet, there is a huge traditional history of application that goes back as far as the Egyptian era. For many modern-day practitioners and receivers alike, the results for many are unquestionable.