… These activities often involve speed, height, a high level of physical exertion, and highly specialized gear or spectacular stunts A feature of such activities in the view of some is their alleged capacity to induce an adrenaline rush in participants.[16] However, the medical view is that the rush or high associated with the activity is not due to adrenaline being released as a response to fear, but due to increased levels of dopamine, endorphins and serotonin because of the high level of physi …