Why you don't need to be Usain Bolt to get a runners' high

More armchair athlete than super-speed sprinter? Fear not - a dopamine reward can still be yours thanks to the way humans are adapted to life on the moveThe sporting excitement of the 2016 Olympic and Paralympic games is now a distant memory, and our attention has long since shifted back to the ups and downs of our own generally unathletic lives. After such a lavish celebration of physical achievement it can be quite a come-down. But from a certain point of view, it’s strange that the phys