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erebedragons.jpg'ere be dragons' encourages people to exercise by walking by using virtual worlds that are created by people's heartbeats: as they travel through this landscape, the physical & physiological changes that occur in their body helps to create different worlds in the game. although there is a sense of being chased, a steady heart rate is required to keep the world alive, so that the landscape blossoms & becomes colourful & light. [bbc.co.uk|i-am-ai.net]