The marathon is one of the most popular tests of human endurance. Globally, there are over 800 marathons held every year, for professional athletes and amateur runners alike. But exactly what are you willingly putting yourself through when you sign up to a race? In this video, Unveiled discovers exactly what happens to your body when you run a marathon!

Have you run a marathon before? Would you like to run one? Let us know what you think about running a marathon!

This is Unveiled, giving you incredible answers to extraordinary questions!

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