Tom Hughes has revealed filming I Am Soldier was a huge challenge.
The film follows Tom's character Mickey Tomlinson as he undertakes training to join the SAS, and the 28-year-old actor admitted he saw the role as a challenge.
"It was exhausting but in a really good way. But that was part of the attraction of the job. The military's never held much appeal to me and it's quite unique to get the opportunity to come and find out really what it's like to be a soldier," he said.
" I've never been inclined to sign up for the army, so I was intrigued to find out what it would be like and to push myself to those limits to see if I could take it."
The About Time actor added: "What we're doing is 5-10 per cent of what the guys actually go through, but even at that level it is a hell of a demand physically and mentally. It's a bit different to sitting in your slacks watching Loose Women and drinking tea."
Tom admitted he had his doubts before agreeing to the role in Ronnie Thompson's drama because of its low budget.
"You can never be certain of these things, but Ronnie intrigued me to begin with," he said.
The actor, who found fame in Ricky Gervais and Stephen Merchant's Cemetery Junction, made sure he was on the same page as Ronnie before filming.
"[We] spoke very early on about what kind of film he wanted to make, and he was very clear he didn't want to make a political film - he wants to make a film which showed soldiers are people not numbers. I felt there was a chance that [our] spark could make something magnificent."
:: I Am Soldier is out on Blu-ray and DVD now.