Kelly Brook appears to be very serious about sticking with her new fitness plan - and promoting Atkins diet products.On Saturday, the curvaceous beauty, 35, took to her Instagram account to upload a picture of herself pumping some serious iron in the gym, as she held a barbell high above her head.Wearing an all-black ensemble in the greyscale photograph, Kelly shows good form as she stands firm while balancing the heavy weights during her Los Angeles workout session.Scroll down for video  Pump it up: Kelly Brook shared a snapshot of herself working out at her Los Angeles gym on SaturdayAs well as announcing that she was 'back in the gym' with her personal trainer Ashley Borden, the British star also shared a shot of herself about to eat an Atkins bar. RELATED ARTICLES   
  
  
  
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However, with her face cut off in the picture, her followers were instead treated to a full-on view of her ample cleavage as she prepared to chow down.She just became a spokesperson for the diet company and she showed off the early results of her new weight-loss mission on Thursday. Getting it off her chest: She also promoted an Atkins bar in a cleavage-baring photograph On Wednesday, Kelly displayed her continued commitment to shedding the pounds when she slipped on her tightest fitness outfit and embarked on a morning hike.She grabbed petite gal pal Natalie Loren for support and headed out into Hollywood's Runyon Canyon in her cap and trainers.Kelly, dedicated to her new food plan and healthy programme, was strides ahead of her friends as she flaunted her curves in skintight leggings. Whatever the weather: Later in the day, she braved the rain to go shopping in West Hollywood, California She revealed her toned upper arms in a zip-up gilet, which she wore right to the top to conceal her ample cleavage.Kelly said 2014 had been a year where she neglected herself and didn't focus enough on having a healthy Keto Diet Guide, especially at Christmas.She announced the decision on Wednesday when she tweeted: 'Excited to Start the New @MyAtkins Plan. I over indulged this #Christmas Wanting to feel #Fit #lowcarb #lowSugar #ad' In fitness we trust: Kelly has been in an on-off relationship with renowned gym bunny David McIntosh Setting the right tone: The star displayed her curvy assets in a blue blouse with a pair of grey skinny jeans Speaking about her decision to join the New Atkins Nutritional Approach, she said: 'On the set of my new TV show, it was really easy to reach for the naughty treats, so I've noticed the changes in my body.'I'm guilty of having at least five cups of tea a day with two sugars in, that's 10 spoons of sugar every day, just in my tea.  
  
I've also had a brilliant Christmas but I have over-indulged a little, which I'm sure many people can relate to.'Kelly has been a loyal gym bunny since meeting former Gladiator and personal trainer David McIntosh, who she's yo-yo'd through engagements, cheating and break ups in the last year.Discussing her goals, Kelly added: 'I'm looking to lose a few pounds, but a more important goal for me is staying fit and healthy without having to deprive myself.' Playing in the shade: Despite the gloomy weather, a smiling Kelly still sported sunglasses