That sounds the ultimate challenge even for those masochistic souls who enjoy marathons. However, for Orkney-based William Sichel, it is little more than a warm-up jog .
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Endurance runner William Sichel prepares for his greatest challenge - a 1000 mile, non-stop race
For those who use the lift, rather than the stairs, marathon running will probably remain a closed book. But 24 hours?
