Sarah Williams is an author, blogger, podcaster and marathon runner.
Sarah has recently completed one of the toughest foot races on Earth – the Marathon de Sables.
The MdS is a 6-day, 251km (156 miles) multi-day stage race through southern Morocco in the Sahara Desert, where temperatures often top 50 degrees centigrade.
Sarah talks about what it takes to complete one of the world's most gruelling adventures.
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