Rihanna is set to stay in shape she's reportedly working out

Pop star Rihanna is set to stay in shape she's reportedly working out at 4am.

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Ary Nunez, Rihanna is her busy schedule to star in the very early morning exercise session can mean they are worth, according to the S&M singer's personal trainer.

Nunez told Star magazine: 'Rihanna trains as much as she can, whenever she can. This could be every day or three times a week.

'Her work schedule is extremely demanding, so thank goodness she's naturally a hard-working person. We make time and find time - whether it is at 4am or 9am.'

Although the 23 year-old is the data that is difficult to maintain, even as a natural 'Feminine' frame is lucky.

Nunez added: 'Rihanna has a gifted physique. She can become lean, get 'baby guns' [biceps] and firm up her core quickly.

'Her physique is the epitome of classic beauty, it's feminine, strong, agile, poetic and versatile.'

Rihanna was forced to be treated like a real-life sailor

Rihanna a sailor in real life when the Battleship I was training for her first film role was as a healing force.

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The Rude Boy singer hard boot camp session was attended by cadets in the film as a hard to prepare for this part - which involved being shouted at, weightlifting, running around a ship and swimming!

RiRi told Fandango.com, "One man drilled me, yelled at me, cursed me out, made me do push-ups".

"My best friend was there and I told her, 'I'm about to do acting class. You're gonna want to kill this man but please, just stay in the other room.' She would come in and just look around and be like, 'Did he just say 'F you' to her?'"

However, the Man Down hitmaker admits he behaved like a true cadet to play really helped her.

she explained, "It got you really in the mentality, that's the stuff that they go through; it's not a walk in the park. I wanted to say 'F you' right back but he probably would have thrown me through the window! I was so scared, I just looked at him like, 'I swear I'll get it right, I'll be good!'"

Rihanna had no issue with being the only woman in the film as the guys used to being surrounded by it.

"This is how I grew up; most of my friends were guys. In this case I'm one of the guys. I'm not acknowledged as the female, no sympathy for me.

She added, "She's tougher than most guys on the ship; she walks with that swagger, gets that respect... She doesn't like boys, doesn't like girls. She's just about her weapons and her work".