A businessman is aiming to cycle 240 miles in one day all in the name of charity.
David Finch, managing director of Purple Frog in Thame, decided to take on the challenge after a bet with a friend.
Mr Finch said: “A friend of mine Dan Mullin challenged me £1,000 that I wouldn’t be able to cycle 240 miles in 24 hours.
“He said a man in his fifties who was a bit overweight wouldn’t be able to do it so I decided to try and prove him wrong.
“I am a member of Haddenham Hillbillies Cycle Club and we have done fundraising for charities such as the Florence Nightingale Hospice in the past.
“I have also cycled 270 miles in three days before but this is a real step up.”
Mr Finch is completing the challenge in aid of Dreamflight, a UK-based charity that aims to change the lives of young people with illnesses or disabilities on a holiday of a lifetime.
Established in 1987 the charity annually takes children on holidays to Orlando in Florida.
He said: “I am aiming to raise £7,000 for the charity, which would be enough to take 50 children to swim with dolphins in Florida.
“It costs around £140 per child and so far I have raised £1,000.”
Mr Finch has been training for the ride for two years, including taking up yoga and completing a three-day challenge to cycle from Thame to Paris last summer.
As well as countless 100 mile rides, David is taking on a 175-mile ride in June, which will take him through four different countries.
This month he teamed up with a couple of friends for a 12 hour endurance ride to test his fitness even further.
Mr Finch, 55, who lives in Haddenham said: “I am taking on the big challenge on July 31 on a circuit around Lake Vyrnwy in Wales.
“I decided to use a circular route because it makes it easier for people to support me and also makes it easier in terms of refuelling.
“I have been there before and it is a beautiful place.
“Part of me still thinks I’m a bit mad for doing this but it would have been very difficult for me to say no because I do like a challenge.
“I am looking forward to it a bit more now that I have done lots of training and some preparation races.
“I am actually aiming to do it in 21 hours which gives me three hours spare.
“I am not worried about the distance, it is keeping going for the sheer length of time.”
Mr Finch said he was managing to fit in training around his work as managing director of the marketing agency Purple Frog.
He said: “I am doing most of my riding in the evening and at weekends.
“I am aiming to cycle a minimum of 600 miles a month in preparation.
“It is probably more than most people use their cars!”
To donate towards the challenge visit www.make-a-donation.org/fundraisers/david-finch.