Prince William shares five-word 'secret' to staying in his children's good books

has shared a crucial parenting motto that he uses to raise , and .

As a man who regularly attends public engagements and ceremonies, Prince William is no stranger to receiving gifts and mementoes.

But after , the prince was given an NFL football to take home with him.

The NFL Foundation aims to help young people from some of the most deprived areas tackle the challenges they face.

After showcasing his impressive abilities, the prince was given the memento to take him to his children, to which he replied: "Oh, that's very kind." He then added: "Never go home empty-handed."

He added: "That's a crucial motto of being a parent. That's very kind of you, thank you very much. They'll love that."

The prince then joked that he would "do some practice at home and see how many windows I can smash."

The Prince of Wales blew organisers away with his throwing ability, with Sky Sports experts and former Buffalo Bills coach Phoebe Schecter saying: "His arm strength is incredible. I could not believe how far he could throw the ball. He did a great job. Very coachable."

Onlookers were visibly impressed after the prince managed to land the ball into one of several holes on a piece of American football training equipment.

, the former star who now plays for NFL franchise the Jacksonville Jaguars said: "He can throw the ball.

"He can throw the ball better than me. He can get a good spiral on the ball as well, not like me!"

William admitted that he did not understand too much of the tactics involved in the sport and confessed that if he did, he might get into it a little more.

The prince was accompanied on the visit to Kennington Park by Henry Hodgson, general manager of NFL UK, who explained that flag football has become increasingly popular in the UK, with a surge in the number of schools involved and the sport due to be played at the .

, with three games either being played or due to be played in London this season to sold-out crowds.