It seems like new studies come out all the time that offer evidence for how long, when, or what kind of exercise you should do. But fitness expert Gretchen Reynolds says it may take a lot less exercise than you think to see benefits to your health. The author of "The First 20 Minutes: Surprising Science Reveals How We Can Exercise Better, Train Smarter, Live Longer” spoke with Lorraine Rapp and Linda Lowen, the hosts of WRVO's new weekly health show "Take Care."