PIC: Rihanna Works Out in a Bikini

Celebrity Body January 19, 2012 AT 3:00PM By Zach Johnson

Credit: twitter.com/rihanna

She may be on vacation, but that hasn't stopped Rihanna from working on her fitness!

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The 23-year-old "You Da One" singer has been soaking up the sun in Hawaii since Saturday, where she'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.

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How does the musician -- who'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?

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"We focus on the core muscles," trainer Ary Nunez recently told Us of the martial arts- and dance-based workouts she does with the 5-foot-8 star. "And we do a lot of repetitions."

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February 07, 2012 - 9:37am Arial Heart Arial Heart
thank u gina taylor she looks great she is young and beautiful and is is on top of the world enjoy while its last
February 07, 2012 - 9:33am Arial Heart Arial Heart
all u jack robin she is posing and she look gooddddddddddddddddddddddddd
January 21, 2012 - 5:57pm Gina Taylor
I LOVE HER LIVES LIFE TO THE FULLEST
January 21, 2012 - 9:41am Heather Skye
She is so full of herself. Can't stand her or her massive ego.
January 20, 2012 - 4:06pm Marc Anise
She looks nice
January 20, 2012 - 12:22pm Paula Tillett
That was specifically posted for that scumbag Chris Brown!! Can we say posing?
January 20, 2012 - 12:04pm Liberty Tracy Heaver Pals
AMEN, THIS IS TOTALLY A POSE!!!! BAREFOOTED? PLEASE!!!!
January 20, 2012 - 6:59am Julie Hein Williams
She's posing, not working out...geez
January 19, 2012 - 11:48pm Oy Sabai
I would love to get my hands on her!
January 19, 2012 - 11:05pm Amy Campbell
Rihanna is gross with no talent.
January 19, 2012 - 9:17pm Sharon R
Yeah, I mean isn't that how we ALL exercise? Barefoot in a bikini with a sultry stare....
January 19, 2012 - 7:14pm Monica Buchanon Moody
Oooh to be young...miss those days. She looks fabulous! (Now lets how her mind is also in good shape)
January 19, 2012 - 6:20pm Nicola Hill
US get a grip
January 19, 2012 - 5:43pm Laurie Griffith
If this chick is actually back w/the d0uche who beat her up, I hope the next one makes the one we know about feel like she was being patted by kittens! ANY woman who goes back to a man she was beaten up by deserves EVERY BLOW he gives her when she gets back. STUPID, STUPID B!TCH.
January 19, 2012 - 5:08pm Nakee Haj
Amy right on point. She doesn't even have on shoes. It looks like she is just fooling around taking pics.
January 19, 2012 - 5:08pm Nakee Haj
Amy right on point. She doesn't even have on shoes. It looks like she is just fooling around taking pics.
January 19, 2012 - 4:53pm Lindsay Kay Wescott
she has a beautiful body, finally a celeb with real curves!
January 19, 2012 - 3:44pm Tresa Smith
Whoever is saying this girl is a role model needs to really get new role models. She has become such a skank and pretty much is throwing it in anyones face.
January 19, 2012 - 3:36pm Amy Lee Sol
she is just posing for a picture