Masters swimmer John Griffin is on course to complete his challenge in 2024 of swimming a million metres, while aiming to raise £1 million in the process for the Cornish Air Ambulance. John is 70-years-of-age and has never swam this distance over a period of a year before, but wanted to set himself a lofty challenge in retirement. He lives in Cornwall and the Air Ambulance is close to his heart. Listen to John's approach, training regime and fundraising feats in this engaging chat.If you...