A policeman from the Metropolitan Force will be swapping the beat on the streets of London for a cycle challenge that will see him take on the national three peaks.
Jim Collin from North Weald near Harlow will be taking to the saddle as he rides 450 miles and climbs 11,000 ft in the space of a week as he rides to the top of the highest mountains in Wales, England and Scotland - Snowdon, Scafell Pike and Ben Nevis, the East London Guardian reports.
"It's a daunting challenge, but all the hard work will be worth it," he said.
Mr Collin is seeking to raise £1,000 for the Box, an Epping-based charity that provides counselling and advice for young people.
The last time police got involved with someone leaving tyre tracks on Snowdon, it was a less celebratory affair.
Officers from the North Wales force arrested Gloucestershire man Craig Williams for trying to drive a 4x4 to the top of the mountain this week.
He told the BBC it was on his list of 50 things to do before he dies.