The line up of celebrity contestants on BBC's Tumble are all struggling with injuries.
After one celeb was forced to QUIT after dislocating their knee, others have also been left in "serious pain".
The celebs - including Girls Aloud's Sarah Harding and TOWIE's Lucy Mecklenburgh - have been put through their paces by pro partners ahead of next month's live shows.
A source told the Daily Star newspaper today: “All the celebrities are in serious pain.
"They are covered in blisters and bruises and suffering from severe injuries.
“Some are worse than others but there is a realistic fear some more names will have to pull out injured before the show even starts.”
Our insider added: “Even if they do make it to the start line there’s no guarantee they will get through the live shows unscathed.”
LOOK IF YOU DARE! > PICTURES! Tumble celebrities suffer shocking injures
Other stars who have been in training for the past six weeks include world boxing champion Carl Froch, EastEnders actor John Partridge and Loose Women host Andrea McLean.
Also joining the celebrity line-up are BAFTA award winning ‘Wolfblood’ actor Bobby Lockwood, Sugababe Amelle Berrabah, Dynasty icon Emma Samms and Ian ‘H’ Watkins from Steps.
Tumble starts on August 9 on BBC One.