Derek tackles two of our well-loved mountain ranges - the Black Mountains in the Brecon Beacons and the Glyders in Snowdonia. Starting in the small village of Bwlch, his walk explores the history of the Rhiangoll Valley and the village of Cwmdu, before hitting the hills to follow the Beacons Way, up and over and back to Bwlch. His next challenge is to climb one of Wales' super-mountains - Glyder Fawr at over 3200ft! It's tough going, with scrambling and thick fog - will he get to the top?

Derek's final instalment has a very personal connection to his contributors who have overcome injury and disability to get out and about. He starts in Pembrokeshire, in the quiet fishing village of Porthgain to meet local seaman Captain Brian Thomas, who spent weeks in a coma after collapsing when out walking. They also explore the area's industrial past and soak in the stunning sea views. Finally it's right to the top of Wales, to RSPB Conwy to meet Nicola Cockburn, who's been blind since birth, and find out what's involved when she goes out walking. Derek also hears more about how her passion for birdwatching helps her get the most from going for a walk.