Kirsty Young's castaway this week is Professor Hugh Montgomery.

His area of academic specialism is intensive care medicine and he's also known for his pioneering genetic research into the ACE fitness gene - which determines our capacity for either strength or endurance.

In themselves significant achievements. But he is also, a children's author, an ultra-marathon runner and the current holder of the world record for playing piano underwater. At the age of only 15 he was also part of the dive team that investigated the treasures of The Mary Rose.

He says, "I've learnt that life can end randomly and pointlessly at any time. I don't want to be on my death bed and think 'damn! I wish I'd learnt to paint and write songs'".

Producer: Cathy Drysdale.