Around 6,000 people took part in the world's largest obstacle course near Stamford this weekend.
The grounds of the Burghley House country estate were transformed into the course.
The 'Dirty Weekend' challenge was 20 miles long and had over 200 obstacles.
The world’s longest set of monkey bars and the world’s longest “cat crawl" were among the challenges on offer.
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There'll be some dense patches of mist and fog about first thing this morning but it will clear later. Then, a cloudy but mostly dry day.
It will be a bright start in places but the cloud will thicken from the north during the afternoon and there'll be a few spots of rain.
Students at the University of Cambridge have raised money for charity by producing their own naked calendar.