At the height of summer, Matthew Sweet and guests turn their minds to tennis, beaches and walking.

As Wimbledon continues, Benjamin Markovits and William Skidelsky consider the philosophy of tennis; New Generation Thinker Des Fitzgerald explores the geography of a little known beach in Cardiff city centre; Rachel Holmes goes on a walking tour of Eleanor Marx's Sydenham in south London.

A Weekend in New York is by Benjamin Markovits
Federer and Me: A Story of Obsession is by William Skidelsky
Eleanor Marx: A Life is by Rachel Holmes
The links between Japan and Wales, and the geography of a particular Welsh beach are explored by KIZUNA: Japan | Wales | Design opens at National Museum Cardiff runs until 9 September 2018.

Des Fitzgerald is a lecturer in sociology at Cardiff University who studies the history of medicine, science and neuroscience and city life.
New Generation Thinkers is a scheme run by the BBC and the Arts and Humanities Research Council to select ten academics each year who can turn their research into radio.

Producer: Craig Templeton Smith.