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13 April 2012, 07:31 | Updated: 13 April 2012, 07:34
The 'We Found Love' singer admits she was "terrified" of the drill sergeant who helped get her in shape for the film.
Rihanna has revealed details on the intense workout regime she was forced to undertake in preparation for her role in the new film Battleship.
The 'You Da One' star told the Daily Mirror that she was being "cursed" at and ended up being "terrified" of his wrath.
She confessed: "He yelled at me, cursed me, made me do push-ups and I wanted to curse him, but he probably would have thrown me through the window.
"I was so scared I just stood there and looked at him and said, 'I swear I'm going to get it right, I swear, I swear, I swear. I'll be good'."
The Bajan star also confessed that she was frustrated at the start of the training because she didn't see the benefits of being yelled at all day.
"At first I didn't see why I had to be yelled at so much. I thought, 'Is this necessary? Really? Do you have to yell or can you just teach me how to stand to attention?' But then I understood how it helped bring me out of my usual comfort zone," she added.
The singer also paid tribute to her time as an army cadet during her younger years admitting it helped give her some sort of insight into what to prepare for.
She said: "It was definitely helpful. We used to shoot on a range. I did a lot of training, a lot of discipline. So I had the army etiquette from a young age."
The 'Talk That Talk' star is making her first big screen debut in the alien blockbuster and recently told Capital that she was hoping to get into comedy in the future.