How does running affect the brain and muscles? Is it dangerous for your knees? If exercise is medicine, what is the correct dose? And what does it mean to be in good shape? Brodie Ramin, a doctor and specialist in first aid and addiction treatment, an assistant professor at the University of Ottawa and a big fan of running, talks about the benefits of this activity and shares his own story of falling in love with running. He examines how physical exercise affects the body—from the top of the head and moving downward—explaining how running helps fight depression, insomnia, addiction, and stress.