Karl Henry

Karl Henry is one of Ireland’s most recognised personal trainers and was previously the expert on Operation Transformation which aired on RTÉ One for 17 years. In January 2025, Karl kicked off The 40 Day Health Challenge as the Personal Trainer. For 40 days, participants around Ireland ate well, moved more and focused positively on their mental health. Karl has a BSc (Hons) in Sports Science and Sports Management from University College Dublin, as well as two personal training qualifications: A.C.E and A.A.B.S. Karl runs a School of Wellness online course and hosts the weekly Real Health podcast. His book The Walking Effect: The Magic of Walking for Wellness and the Best Places in Ireland to do it was published by Gill Books in October 2025 and was shortlisted for the Bookstation Lifestyle Book of the Year at the Irish Book Awards. Karl lives in West Cork.