For most people just finishing a marathon is enough, but these guys are pushing themselves just a bit further at this year's London Marathon...
Tony Barrance will have to keep his eye on the ball! He's trying to break the record for the fastest marathon finished while dribbling a football.
Don't stop the bride! Eleanor Franks is hoping to get round the course in the speediest time while wearing a wedding dress. This year's run is on Sunday 17 April.
Karl Twomey is attempting to do the 26 miles running backwards! We just hope he doesn't miss the finish line...
Uli Kilian wants to break the record for running while solving Rubik's cubes. He has to solve 100 puzzles but can't carry them all so is roping in a team to help with the heavy load!
Andy Jackson has his sights on running the quickest marathon dressed as a book character. We wonder if he'll still be Mr Happy at the finish line!
Susie Hewer will be prepared for cold weather on her run around the city. She's trying to do the fastest run while knitting the longest scarf!