Body & Brain (also known as Dahn Hak or Dahnhak), formerly called Dahn Yoga, is a business founded in 1985 by Ilchi Lee that teaches a Korean physical exercise system called Brain Education. In Korean, dahn means "primal, vital energy", and hak means "study of a particular theory or philosophy". News sources have described its exercises as "a blend of yoga, tai chi, and martial arts exercises". Body & Brain is taught through for-profit studios as well as community centers. Ilchi Lee's Brain Education is considered pseudoscience. Training methods According to Body & Brain Yoga Tai Chi: A Beginner's Guide to Holistic Wellness, a book published by Best Life Media, Body & Brain has "three unique characteristics": "the mastery and use of energy", "enhancing the body-brain connection", and "self-managed, holistic health care". The practice draws upon traditional notions of ki, also known as chi or qi. A typical class begins with what is called "Meridian Stretching" exercise, which is believed to stimulate the energy in the body. After these stretching exercises, practitioners normally follow a sequence of postures. Classes often include elements of meditation, as well. An article by three physicians from Weill Cornell Medical College published in the Journal of General Internal Medicine reported the conclusions of a 3-month study of community-based mind-body training methods. The study surveyed 171 adults enrolled at various Body & Brain Centers in the New York City area. All of the participants had taken ten or fewer classes at the beginning of the study. The article concludes that participants reported "moderate improvements after 3 months of practice" with increased scores "in all [of the surveyed] domains of health-related quality of life, fewer depressive symptoms, less trait anxiety, and greater self-efficacy". Brain Wave Vibration Brain Wave Vibration is promoted as a mental and physical health enhancement technique developed by Ilchi Lee. According to Lee, brain waves are a type of vibration that has a significant effect on a person’s health and outlook on life. A form of moving meditation (head-shaking), the technique was described by one Body & Brain instructor: "By shaking your head and vibrating your body, you bring healing energy. You just need to close your eyes and turn your head right and left, right and left, focusing on the center of your brain and keeping a rhythm. Afterwards, you feel very rejuvenated!" As part of CNN's three-part investigation into controversy and lawsuits