“What we’re finding in the research on physical exercise is, the physical exercise is at least as good as antidepressants for helping people who are depressed … physical exercise changes the level of serotonin in your brain. It changes, increases their levels of “feel good” hormones, the endorphins. And also -- and these are amazing studies -- it can increase the number of cells in your brain, in the region of the brain, called the hippocampus,” he continues.

These studies have been first done on animals, and it’s very important because sometimes in depression, there are fewer of those cells in the hippocampus, but you can actually change your brain with exercise. So it’s got to be part of everybody’s treatment, everybody’s plan.”