Zac Efron fell and hurt himself on the set of High School Musical 3: Senior Year - after he had to run around a rotating hallway.

The 20-year-old actor - who plays a basketball player in the Disney films - had to jump and slide down a revolving school corridor whilst performing a song and dance number.

And he admits he fell hard whilst filming the energetic scenes.

He says, "We had always talked about doing a scene in a revolving setting and then one day I walked in and there was a revolving hallway. It was like a square inside a big hamster wheel. I got there and the crew said, 'Ok, let's go!' I was like, 'I haven't rehearsed yet guys!'

"So Kenny Ortega, the director, told me to rehearse it but also filmed it at the same time. It was crazy! I fell over a few times. At one point it reversed direction and I wasn't ready - I ate it then!"