The brain is certainly not the largest organ in the body, but it is the most complex. There are many things we do that can harm the brain, but the latest research shows if you want to enhance the function of your brain, exercise will help you do that.

Today we are joined by Dr. John Ratey, a clinical associate professor of psychiatry at Harvard Medical School and the author of a new book, SPARK: The Revolutionary New Science of Exercise and the Brain, which will be released soon.