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Tina O'Brien in Bathing Suit is "Following the Sun" 

She had a personal trainer for extra support.

British actress Tina O'Brien is enjoying the sun, sand, and blue skies on vacation with her family in Antalya, Turkey. The Coronation Street star posted a video of herself on her travels, looking stunning in a series of swimsuits as she hit the beach and tried adventurous activities such as ziplining. How does she stay so fit? Read on to see 5 ways O'Brien stays in shape and the photos that prove they work—and to get beach-ready yourself, don't miss these essential 30 Best-Ever Celebrity Bathing Suit Photos!

1

Scrambled Eggs for Breakfast

O'Brien enjoys what she calls a "rainbow breakfast" consisting of scrambled eggs and brightly-colored vegetables. "Eggs are rich in several nutrients that promote heart health, such as betaine and choline," says registered nutritionist Jo Lewin. "A study of nearly half a million people in China suggests that eating one egg a day may reduce the risk of heart disease and stroke, although experts stress that eggs need to be consumed as part of a healthy lifestyle in order to be beneficial."

2

Milk Every Day

O'Brien has milk (in glass bottles) delivered every day. "Dairy isn't necessary in the diet for optimal health, but for many people, it is the easiest way to get the calcium, vitamin D, and protein they need to keep their heart, muscles, and bones healthy and functioning properly," says Vasanti Malik, nutrition research scientist with the Harvard T.H. Chan School of Public Health.

3

Marmite In Hot Water

Mike Marsland/WireImage

One of O'Brien's more unusual winter drinks is Marmite, a savory spread made of yeast which is chock-full of nutrients, mixed into hot water. "Marmite is also high in folic acid, providing nearly 50% of the recommended daily allowance per serving," says nutritionist Shona Wilkinson. "Folic acid works to reduce the risk of high blood pressure, increase the chance of conception and prevent birth defects."

4

Home Made Apple Crumble

Karwai Tang/WireImage

O'Brien loves baking with her family, especially cozy dishes like fruit crumbles with apples and blackberries. "Fruit and vegetable intake are thought to be associated with greater bone density and improved bone health," says registered nutritionist Nicola Shubrook. "Findings from a study on healthy women suggested apples, in particular, may minimize the amount of calcium lost from the body and hence improve bone strength."

5

She Accepted Help When Needed

O'Brien found it difficult losing weight after having three children—so she got some help, and lost 42 pounds after hiring a personal trainer and following a healthy diet. "It serves me right because I thought, 'I'm naturally slim – it will just drop off!' But it really didn't!" she says. "When I first had Scarlett I did absolutely nothing. I didn't want to be running round the block with a week-old baby!"

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