Tracking your exercise is a simple and surprisingly effective way to motivate you to move more. Most of us own an exercise tracker, whether it’s the fitness app on our phone or a special bit of kit on our wrist. But how do they make us more active? Professor Carol Maher, from the University of Southern Australia, has found wearing an activity tracker really can encourage more physical activity. She tells Michael how the instant feedback allows people to take control of their activity levels. Michael learns the extra movement a tracker encourages can really help improve your brain power and reduce your risk of certain cancers and type 2 diabetes. Volunteer Rumbi opens her fitness app and steps out to see if it really works.Series Producer: Nija Dalal-Small Science Producer: Catherine Wyler Researcher: Sophie Richardson Researcher: Will Hornbrook Production Manager: Maria Simons Editor: Zoe Heron A BBC Studios production for BBC Sounds / BBC Radio 4.