Matravers students George Beer and Rory Tucker completed a canal run from Bradford on Avon to Devizes on February 24 in aid of cancer research.
The two friends, who are in Year 13 at the school, decided to raise money for cancer research before Christmas, setting themselves the challenge of running 11 miles along the canal.
George, 18, and Rory, 17, who both enjoy playing football, were aiming to complete the distance in two hours, but managed to finish in one hour 37minutes.
They have already raised £540 for Cancer Research UK, smashing their original target of £200, and the pair said that money is still coming into their Just Giving page.
George said: “We didn’t do much training beforehand as we are both quite fit from playing football and thought we could just wing it. It went really well and we did it because we wanted to give something back.
“We are now thinking about doing something else, probably a triathlon.”
To donate, visit www.justgiving. com/George-Beer