You’re probably already convinced of the importance of physical exertion, going outside, and staying physically fit and healthy. But what about the fitness of your brain? We talk to the neuroscientist, Michael Merzenich, about the significant neurological benefits of going fast, going outside, and undertaking new activities; the more effective and less effective ways to exercise our brains; the changes to our brains caused by the time so many of us — and our kids — are spending in front of phone, computer, and TV screens; and more.