Reflexology
Reflexology, or zone therapy, is the practice of massaging, squeezing, or pushing on parts of the feet, or sometimes the hands and ears, with the goal of encouraging a beneficial effect on other parts of the body, or to improve general health.
There is no consensus on how reflexology is supposed to work; a unifying theme is the idea that areas on the foot correspond to areas of the body, and that by manipulating these, one can improve health through one's qi.
(Jundubz, Foot Vital Point Refrexology, Wikimedia Commons. CC: BY-SA 3.0.)