Michael Mosley ventures to his local pool and the sea to explore the unique benefits of going for a swim - from improving memory and mental agility, to boosting longevity. Professor Hirofumi Tanaka, from the University of Texas at Austin, reveals why water-based exercises like swimming are especially good for improving the elasticity of your blood vessels and a new way to exercise in the pool. There really seems to be something special about being in the water that can help your heart, improve joint pain and even boost your brain. Surprisingly, water-based exercise can be more beneficial than land-based exercises!

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Producer: Nija Dalal-Small