#GK-21 The Science Behind the Fitness Craze

Staying fit is one of the most important health promoting activities, but all the advice can get confusing. How can you exercise safely? How much is enough and how much might be harmful? Do you need a personal trainer and if so, how would you know if that person is qualified? What about equipment vs good old-fashioned walking? Guest: Gina Kolata, Science writer for the New York Times and author of “Ultimate Fitness.”