Professor Nanette Mutrie, Chair in Physical Activity for Health, presents her inaugural lecture entitled "Encouraging People to 'Sit Less and Walk More': The Story so far and Future Plans". Professor Mutrie explains why 'sit less and walk more' is the byline of the Physical Activity for Health Research Centre and demonstrates what has been learned so far about encouraging people in related behaviour change. For over a decade Professor Mutrie has been working to determine the best ways to help people put more walking into their lives. Recorded on 10 December 2013 at the University of Edinburgh's Old College.