This is a system of self-massage promoted most recently by Michio Kushi. More than 5,000 years ago, Chinese Taoist monks observed it was instinctive for a person to touch or hold an injured or painful body part, a form of self-healing. They developed a system called tao-yinn: tao meaning the way and yinn meaning a gentle approach. The name has evolved to Do-In, and the technique is used to sustain overall health, as well as treat specific physical problems.