Flat out: It appears Henry Cavill is keeping up his fitness regime as he was put through his paces in a gruelling charity run at an army training course on Sunday

The Batman v Superman star climbed ladders, crawled through mud and swam in near-freezing water in the event organised by the Royal Marines Charity and the Devon Air Ambulance.

The course, which is used daily for Royal Marines recruitment and officer training, goes across the rough moorland and woodland of Woodbury Common near Lympstone.

It and features tunnels, pipes, wading pools and an underwater culvert called the sheep dip – an obstacle so tough that even the Marines are said to have nightmares about it.

Henry looked knackered after the event as he lay flat out in the mud, no doubt wishing he had the capabilities of his superhero character.

Ice cold: Henry closed his eyes to go under the so-called sheep dip, which even the hardest of Marines are scared of

All hands on deck: Henry looked a picture of determination as he waded through the mud lying prone

He’s only human: The Batman V Superman star (pictured right in the film) climbed ladders, crawled through mud, and swam in near-freezing water in the event organised by the Royal Marines Charity and the Devon Air Ambulance

Chilling out: Henry was lifted out of the notorious ‘sheep dip’ by a friend after he dunked himself and swam through

Meanwhile, Henry Cavill’s manager has said a new standalone sequel to the Superman film Man of Steel is in the works.

Cavill reprised his role as Superman earlier this year in Batman v Superman: Dawn of Justice and is currently filming a Justice League film which is due out next year.

His manager Dany Garcia told Newsweek that Cavill is ‘beginning to expand’ the Superman world and is in very early development for the standalone sequel.

Justice League features an ensemble cast, bringing together DC Comics heroes Batman (Ben Affleck), Superman (Henry Cavill), Wonder Woman (Gal Gadot), the Flash (Ezra Miller), Cyborg (Ray Fisher), and Aquaman (Jason Momoa).

Happy chappy: Henry gave the thumbs up as he waded through a stream with his team close behind him

Knackered: The British heart-throb, 33, looked dead on his feet after completing a six-mile obstacle course at the Royal Marines Endurance Course on Woodbury Common, Devon.

Give me ten! Henry was put through his paces on the course and took a cheeky time out while sitting on a ledge

All smiles: After recovering from the tough ordeal Henry posed for some photos with his team

Tough track: The course, which is used daily for Royal Marines recruit and officer training, goes across the rough moorland and woodland of Woodbury Common near Lympstone

Gruelling: The course features tunnels, pipes, wading pools and an underwater culvert called the sheep dip – an obstacle so tough that even the Royal Marines have nightmares about it

Batman and Wonder Woman assemble a team consisting of The Flash, Aquaman and Cyborg to face the catastrophic threat of Steppenwolf and his army of Parademons.

The film is said to have a more light-hearted approach than its predecessor Batman v Superman.

The movie was said to be to ‘gritty’ and grossed a disappointing $872.7 million worldwide on a $250 million budget.

Producer Geoff Johns told The Wall Street Journal: ‘Mistakenly in the past I think the studio has said, ‘Oh, DC films are gritty and dark and that’s what makes them different.’

‘That couldn’t be more wrong. It’s a hopeful and optimistic view of life. Even Batman has a glimmer of that in him. If he didn’t think he’d make tomorrow better, he’d stop.’

Another on the way? Henry Cavill’s manager has said a new standalone sequel to the Superman film Man of Steel is in the works

Hunk: Cavill reprised his role as Superman earlier this year in Batman v Superman: Dawn of Justice and is currently filming a Justice League film which is due out next year