Are you female, aged between 18-25 years old OR 50+ years old, and currently not participating in regular physical activity? If you can answer yes to these questions, would like to increase your physical activity levels, and are interested in participating in a research study, we would love to hear from you! The study will require you to walk for 30 mins on a treadmill (Park campus) on 6 separate occasions. For further information please contact Dr Florence Kinnafick on florence.kinnafick@northampton.ac.uk or 01604 893328. By enquiring you are not committing yourself to taking part.