What happens to the body on rollercoasters and rides

From jumping out of a plane to riding rollercoasters again and again, some people thrive on thrill. But unlike excitement or fear, thrill can't be defined as a single emotion. In an attempt to define what makes an experience thrilling, and why some people can't get enough, a self-titled Thrill Engineer strapped cameras and heart rate monitors to volunteers. In an attempt to define what makes an experience thrilling, and why some people can't get enough, a self-titled Thrill Engineer strapped cameras and heart rate monitors to volunteers. Professor Of Thrill Brendan Walker (pictured) tries out the Ultimate Abyss aboard Royal Caribbean's Harmony of the Seas These participants then plummeted towards the ground on a 100ft-drop (30 metre) slide to help the professor determine the science of thrill.