1. School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, UK
2. Department for Health, University of Bath, UK
3. Physical Activity Measurement Consultant, Bwlch, Wales, UK
4. Faculty of Health and Applied Sciences, University of the West of England, Bristol, UK
5. Centre for Transport and Society, Department of Geography and Environmental Management, University of the West of England, Bristol, UK
6. School of Policy Studies, University of Bristol, UK
7. Later Life Training LTD, Perthshire, UK