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In More or Less Tim Harford asks whether claims that keen runners might be damaging their health are really true. Joggers will find comfort from an analysis of the numbers by Alissia White of consulting firm Bazian. And is infidelity among cruise passengers rife? A survey claims that one in five passengers admits to cheating on their partner on a cruise and that in 80 % of those cases, their partner was on board. But a closer look at the story shows that the truth is not nearly so scandalous.

Trending looks at the fashion for posting adverts and videos online that show people with disabilities "overcoming" adversity, along with the caption 鈥淏e Inspired鈥�. Some critics have labelled this "inspiration porn" and see it as oversimplifying disability and using it as an emotional hook for non-disabled people. Presenter Mukul Devichand is joined by bloggers Mel Finefrock and Charlie Swinbourne to discuss the issue. Trending also talks to the man behind the anonymous Persian parody Facebook and Twitter account that mocks the teachings and sermons of Iran鈥檚 mullahs.

In the Why Factor, Mike Williams explores why the seemingly obsolete technology in mechanical watches is still highly desirable and what wearing a luxury watch says about its owner鈥檚 desire for a status symbol.

(Photo: Older couple running together outdoors. Credit: Science Photo Library)