Two young men with a British father and Chinese mother are in the middle of a massive journey that few have ever completed.
They are running the entire length of the Great Wall of China – effectively finishing a marathon every day for six months through deserts, mountains and dangerous crumbling ruins.
Most people would not know how to even plan such an undertaking, but they grew up with a special coach – their father, who made the same journey almost 35 years ago.
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