This is a traditional song from the north of England, all children know it and try to sing it in faster and faster. Also, they have to crouch down or stand up as they sing (like on the video).

Oh, the grand old Duke of York
He had 10,000 men
He marched them up to the top of the hill
And he marched them down again

And when they were up, they were up
And when they were down, they were down
And when they were only half-way up
They were neither up nor down

Oh, the grand old Duke of York
He had 10,000 men
He waltz them up to the top of the hill
And he waltz them down again

And when they were up, they were up
And when they were down, they were down
And when they were only half-way up
They were neither up nor down

Oh, the grand old Duke of York
He had 10,000 men
He marched them up to the top of the hill
And he marched them down again

And when they were up, they were up
And when they were down, they were down
And when they were only half-way up
They were neither up nor down