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"She may be on vacation, but that hasn&amp;apos;t stopped Rihanna from working on her fitness!\r\n\r\nThe 23-year-old &amp;quot;You Da One&amp;quot; singer has been soaking up the sun in Hawaii since Saturday, where she&amp;apos;s been spotted paddle boarding and swimming with the sharks. The bikini-clad star hit the gym on Wednesday, sharing a photo of herself exercising on the elliptical via Twitter.\r\n\r\nHow does the musician -- who&amp;apos;s been hooking up with her violent ex Chris Brown for nearly a year, multiple sources tell the new issue of Us Weekly-- maintain her amazing abs?\r\n\r\n&amp;quot;We focus on the core muscles,&amp;quot; trainer Ary Nunez recently told Us of the martial arts- and dance-based workouts she does with the 5-foot-8 star. &amp;quot;And we do a lot of repetitions.&amp;quot;"^^<http://www.w3.org/2001/XMLSchema#string>
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