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Can I say WOW?!! Marathons are already hard, but a triathlon? So much harder! But that didn’t stop Jennifer Lopez the diva from joining and getting down & dirty for charity! According to reports, J.Lo finished the Nautica Malibu Triathlon in three and a half hours early today. The singer smiled as she crossed the finish line after swimming, biking and running. Jennifer Lopez also told the onlookers, “Thank you guys so much. This is an amazing day!” What do you think of her fit triathlete body guys? Sexy or not??

Cameron Diaz is not one of those stars who skip breakfast (especially the next day after exercising).

After a hard workout at the Gym on Nemo in West Hollywood, the athletic actress was spotted ordering a big burrito and a full fat latte for breakfast the following day. This only proves that she knows how to balance things in life!

Photo credit: Anthony Dixon / WENN

Britney Spears unintentionally caused some trouble at Bally’s Total Fitness in Culver City last week, when the club accidentally double-booked the same exercise room for both her and another regular scheduled fitness class.

An eyewitness tells OK! that the singer’s trainer booked a room for her at 7 p.m. PT, not realizing that another class was already scheduled to start in the same room at 7:30.

When Bally members showed up for the class, they were told it had been cancelled because Britney was using the room for her private session. This started a frenzy at the otherwise low-key fitness club. Eyewitnesses tell OK! many members thought Britney was behind the mixup and had used her celebrity status to keep the room for herself. [Source]

The fitness club says Britney had nothing to do with the scheduling mixup - they admit it was their fault in double-booking the exercise room.

Sources at the gym also say that Britney has recently been incorporated more vigorous dance training into her workouts - does that mean she’s preparing a big comeback?

Photo credit: WENN

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Halle Berry got back into shape just two months after giving birth to her first child. Apparently, her secret to losing her pregnancy pounds is just eating healthy and exercising (and probably being in love too, as she just got engaged to her boyfriend and baby-daddy Gabriel Aubry).

In terms of diet, Berry is eating lots of vegetables, lean proteins and complex carbohydrates, as well as drinking a large quantity of water.

The 41-year-old actress also works out for 60 minutes, five days a week with celebrity trainer Ramona Braganza.

Their sessions include three cardio segments – on the elliptical, as well as kickboxing and then a stairs or hill climb – then also does a strength-training routine that include abdominal work and leg exercises. [Source]

Here are some pictures of Halle at the 15th Annual EIF Revlon Run/Walk for Women in Los Angeles last week.

Photo credit: Jody Cortes / WENN