The model and former Love Island contestant received a knock after a highwire trick went wrong during one practise session.
"I've had my first injury. But training is going really well, it's so much fun, the first week just felt like we were in one big playground," Emily told the Daily Star Sunday.
"The fun didn't last long and we realised we were in a proper circus, learning serious circus stunts," she continued. "Last week it got real, which kind of woke us up a bit. No more playing around now - this stuff is dangerous."
The show kicks off on Sky One next Sunday.