All you need to do is watch the video below and count the number of bounces the little girl makes.
You will find all the details you need on their website and they even give you a helping hand with three answers to choose from: a)23 b) 33 c) 43. Its so easy so why not have a go?
Entries close at midnight on 10th January and the winner will be announced on the 11th Jan.
Good luck
Karen x