We all know that walking is hugely beneficial for our health and wellbeing, but we can get even fitter, and use nearly twice as many muscles, by introducing some poles and a simple technique. Join Michael Mosley as he delves into the science of Nordic walking to find out how it can enhance our walks by burning more calories and helping to ease back pain. He speaks to Dr Jennifer Reed from the University of Ottawa Heart Institute about her research, which has demonstrated why Nordic walking is one of the best forms of exercise for improving your heart health. Our volunteer Jessica picks up some poles and transforms her regular walks into a full-body workout. Series Producer: Nija Dalal-Small Editor: Zoë Heron A BBC Studios production for BBC Sounds / BBC Radio 4.