Clare Balding explores the beautiful Longdendale Trail in Derbyshire, joining long -term friends, Tracey Standring and Christine Valentine. They explain the vital role walking has played in their lives, cementing their friendship and keeping them sane and healthy. They've been walking together for over a year now and they explore new places each week. Neither are keen or particularly competent map readers and Clare tries to convert them with her own expertise, although with a gale blowing along the valley, it's not all that easy.