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Mistress Anna combines pain and pleasure as she puts her clients through gruelling and unconventional workouts.

Kinky participants include an IT professional who loves adult diapers, a bike cross-dresser and a man who likes being punched.

They will perform squats or lunges with weights attached to their genitals or get put through their paces on a rowing machine as Mistress Ann pulls them along with chains attached to their nipples.

Anna, based in Sydney, Australia, said she started the bondage camp two years ago after deciding to combine her two loves.

"It is a sexual turn on for sure," Ray, one of her clients said.

(Image: SBS.com) (Image: SBS.com)

"Mentally there's a certain excitement factor there, physically it's actually very hard work.

"You start to feel like you're out of your own body, sometimes you feel like you're floating on the ceiling.

"You don't feel pain like you normally would in normal circumstances."

Computer programmer Nick likes to wear a diaper and become an infant.

"The fetish fitness classes have helped me start to change my body to better reflect what I want to look like," he said.

(Image: SBS.com)

"I want to be muscular, I want to be fit, I want to be sexy

"No one can judge me more than I've judged myself.”