The Duke and Duchess of Cambridge could enter the London Marathon next year, Prince Harry joked today.
He said: "I have been trying to get myself a place for years. I can't get myself a place. What do you have to do?
"What's fantastic is that my brother and his wife will be doing it next year, I think. He's going to have to now, isn't he?"
Harry made the comments during the BBC's coverage of this year's event, where he will present trophies to the winners.
But a Clarence House spokesman later confirmed the royal couple had no firm plans to enter the race, adding: "It was said in jest."
Tens of thousands of fun runners and amateur athletes set off in bright sunshine as the 32nd London Marathon got under way on Sunday.
Harry said: "It's my first experience on the finish line. I've tried to get out on the course and have a look around, sit outside a pub and watch people go by - the laziest way of doing it.
"It's a fantastic occasion. I always get to hear the atmosphere so to be here and to see it all is great."
The Prince also spoke of his admiration for the athletes involved in the race.
"It's staggering. I always presume that after about 10 or 12 miles your body just shuts down and you go into overdrive because they come across the line, no-one's sweating.
"The only time they smile is when they cross the finish line, a little bit wobbly on their knees but apart from that it's effortless for most people."
Up to 37,500 athletes are expected to finish the 26.2-mile course through the streets of the capital to earn their marathon medals and raise money for countless charities.
As well as the elite athletes and fun runners, a host of celebrities crossed the start line in support of good causes.