Runners are being urged to get out of the starting blocks and sign up for the first Reigate Rampage next month.
The inaugural 5km obstacle and adventure run on Sunday, April 6, is to be held at Littleton Manor Farm equestrian centre, off Flanchford Road, Reigate.
Funds raised will go to four local charities, including the Redhill-based Surrey Air Ambulance.
The Rampage is open to 200 entrants, with 150 signed up so far.
Talking to people toying with the idea of entering, organiser Jon Rayner said: “Surrounded by beautiful Surrey countryside, you will set off on leg-sapping sandy gallops before tackling obstacles designed to challenge your speed, strength and balance.
“With your fellow competitors you will run, jump, duck, climb and crawl through many obstacles, including stream crossings and rope climbs.”
A donation from each entry fee of £30 will be made to one of the four nominated charities – the Air Ambulance, Old Reigatian Rugby Football Club, Spinal Research and The Patrick Evans Foundation.
Runners can raise further funds for their chosen charity through sponsorship and two more runs planned for later this year.
To register, runners should go to: www.reigaterampagerun.co.uk where Air Ambulance runners can get a £5 discount by entering the voucher code GIVEME5.
For more information email: email@example.com or firstname.lastname@example.org The Air Ambulance service in Kent, Surrey and Sussex costs around £6million annually to stay airborne. Receiving no funding from the National Lottery, the charity relies almost entirely upon donations from the public to support its two helicopters based at Redhill and Marden in Kent.