They're cycling from Dronfield to Scarborough this weekend.
Two North Derbyshire residents will be cycling 110 miles-from Dronfield to Scarborough on Saturday-in a bid to raise funds for the teenage cancer trust.
Mark Udall and Matt Norris are aiming to raise over three thousand pounds in total.
Mr. Udall told us why they're so passionate about their chosen charity;
"Me and Matt have both got kids, and we can't imagine what any parent or guardian parent's going through, knowing that their child is suffering from cancer.
"It must be awful."
Meanwhile, Mr. Norris expects it to both a tough test, both physically and mentally;
"We're going to take our time. We think we're going to average around about 13 miles per hour or so.
"So we're expecting around eight and a half hours in the saddle, when we set off at 8am on Saturday the 5th October."
The pair are setting off on Saturday morning from the Aldi store on Sheffield Road in Dronfield.