There is wide agreement that more walking and public engagement in outdoor activities can make a contribution to personal well-being, health and collective sustainability. But how do we go about promoting the benefits of walking and 'the great outdoors' in a culture where it is ever easier to be sedentary and disconnected from the natural environment? Our seminar speaker Jim Walker of the Outdoor Trust charity draws on a wealth of experience as a ranger, trail designer and urban well-being consultant in discussing these challenges for sustainable lifestyle change. Jim will look at methods for engaging citizens in outdoor activities and how these can contribute to wider behavioural change.