Actress Jennifer Aniston has been seen in some bikini’s lately and she is looking pretty good. She has been shooting scenes for her upcoming film "Just Go with It" in the beautiful location of  Hawaii. Shooting near a tropical waterfall, the 41-year-old actress wore a barely-there, hot-pink bikini. Her well toned body, which girls half her age would be jealous of, is not by chance, but something Aniston has worked to achieve. "She’s obsessed with staying fit and young," a source says in the latest Us Weekly.

Also driving Jennifer Aniston to have such a well toned, and beautiful body, is her "Just Go with It" co-star, who happens to be the SI model Brooklyn Decker. "Jen’s intimidated," the source says of Decker. "She’s very conscious of her body." In order to keep her bikini body the way it is, Jennifer Aniston spends at least an hour (sometimes more) daily at the gym at the Four Seasons in Maui — sweating it out on the treadmill and elliptical. I saw her on the treadmill, and it was angled all the way up," one Four Seasons guest recalls. "I couldn’t do that for one minute!" Keep at it Jen, your looking great!

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