Hormones: Adrenaline Sports

Available for over a year

From bungee jumping to cycle couriers, presenter Justin Rowlatt encounters the businesses that run on an adrenaline rush. Endocrinologist Maralyn Druce explains how we are pre-programmed for fight or flight when we receive a nasty shock, while David Kirke - pioneer bungee jumper and founding member of the Dangerous Sports Club - retells the many ways he sought to trigger his own adrenal glands, all in the name of art. Plus, Justin takes a heart-pumping spin through the London traffic on a bike with no gears or brakes, desperately trying to keep up with courier Akos "Kaos" Kis. Producer: Laurence Knight (Picture: Bungee jumper; Credit: melis82/Getty Images)