Choi Kwang Do: The Ideal 21st Century Exercise Our need to move is biological movement is essential for health! But society has changed and exercise must suit the needs of 21st century living. We need a progressively challenging, yet noncompetitive and enjoyable form of exercise that will produce the complete results we need in a shorter time. It must also provide us with the opportunity to get our social needs met (rather than working out in isolation) to keep us healthy for the long term. Choi Kwang Do as a way of life meets this need.  By choosing to exercise regularly in Choi Kwang Do, and by monitoring levels of intensity, frequency and duration, people can achieve optimal levels of health. Because the techniques are based on biomechanics, muscles, tendons and ligaments can all work together to become strong. CKD training also positively influences the functions of the organs and systems in the body, stimulates the brain, helps balance brain chemistry, increases production of antibodies and activates more Natural Killer Cells which improves the immune system. Intensive training, on the other hand, suppresses the immune system.