Dr Murray hopes to cover 28 miles a day for 85 consecutive days to raise £100,000 for the Yamaa Trust, a charity that tackles poverty in Mongolia, and for which he volunteers as medical director.
A BBC documentary team is set to follow Dr Murray as he embarks on the epic run, which will smash the existing world record for the most miles run in a month, and possibly several other records at the same time.
Dr Murray, who will burn around 6,500 calories a day as he runs, has previously embarked on a host of gruelling endurance feats, including a non-stop 120-mile run dragging a sledge in sub-zero temperatures.
You can follow Dr Murray online as he updates us on his progress. Click here to read the first of Dr Murray's updates.
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