Runner’s High – Are we Born To Run?
March 24, 2012 §
The theory: humans evolved to run long distances, and runner’s high evolved to encourage us to do so. If that’s true, then other mammals that have a strong drive for endurance running should also exhibit a form of runner’s high, while mammals that evolved to lie on the couch and watch TV (or whatever ferrets do in their little ferret holes) shouldn’t.
Alternative explanation: running is a fundamentally dreadful activity, and the species that need(ed) to engage in running for survival reasons needed those opiates so that they could do it
via Why Ferrets Don’t Get Runner’s High | Sweat Science.