Director David Yates has said that 'Harry Potter' stars Daniel Radcliffe and Emma Watson like to compete with each other.
Speaking on ABC, Yates said: "They run like maniacs and it's because they are trying to out-compete each other."
"Dan wants to run faster than Emma. Emma wants to run faster than Dan and Rupert [Grint] just wants to be anywhere to try to keep up with the pair of them."
Rupert Grint reportedly said: "I didn't realise it was going to be that fast actually, I was just keeping up with Dan and Emma."
Radcliffe joked: "I'm faster than Emma, I could beat her. There's not even a question in my mind."
