Temple Run new character is Usain bolt for iOS. How to use it?

HI, i love playing android games all day. And as per the latest information i just came to know that a new character has been introduced for the game Temple Run. the name of this character is Usain Bolt. I want to know that how to use usain bolt in this game please let me know.

That's interesting Usain Bolt i think there will be a condition in which you have to unlock it. though i think that's an interesting feature i will see it today.