Couch to 5K
Josh Clark explains how he came up with the idea of the running programme that got millions off their sofas and out jogging.
In 1996 a young TV producer in Boston came up with the idea of a running programme to help people exercise regularly. Couch to 5K running groups now exist all over the world and it has even been endorsed by Britain's National Health Service, the NHS. Elizabeth Davies hears from Josh Clark, who invented the programme.
Photo credit: Science Photo Library