These related therapies originated in the medical system developed centuries ago in China called Traditional Chinese Medicine (TCM). These techniques involve the use of meditation, movement and breath regulation to improve or rebalance the flow of vital energy. These slow, gentle movements can be performed by virtually anyone, regardless of age or fragility. Research has shown that regular use of qigong or Tai Chi exercises can improve circulation, improve immune function and promote a relaxation response in the body. In China today, these therapies are used in many hospitals along with conventional medicine to treat cancer, heart disease and digestive problems.