Renee Zellweger always turns heads when she walks the red carpet. And the Bridget Jones: Mad About The Boy icon's appearance at its world premiere on Wednesday was no exception. The Oscar winner, 55, looked nothing short of sensational in a bright pink strapless figure-hugging satin gown. And earlier that week, Renee stunned at the French premiere in a black lace off-the-shoulder dress which flaunted her beautiful frame.

But a noticeable feature of both ensembles were Renee's perfectly toned arms - and it appears they are her red carpet secret weapon. The actress is known for her gym dedication and has admitted she even works out on holiday, carefully sculpting her perfect biceps and triceps through 'gruelling two-hour workouts'. Renee Zellweger's red carpet secret weapon revealed: Bridget Jones icon loves to show her toned arms achieved through 'gruelling two-hour workouts' in one-shoulder and strapless gowns (pictured at the London premiere of Mad About The Boy on Wednesday).

Earlier that week, Renee stunned at the French premiere as she stepped out in a black lace off-the-shoulder dress which showed off her gym-honed biceps. In a bid to show off her hard work, Renee appears to adopt a 'uniform' of strictly strapless and one-shoulder gowns when she does take to the red carpet. But how does she achieve it? MailOnline takes a look at how Renee's intense exercise regime and dedicated dieting help her turn a jaw-dropping look every time.

Renee once revealed 'run until it hurts' is her motto, but also hikes, swims and does yoga and spin classes to stay trim. 'I have a lifestyle that involves keeping my sanity by going to the gym,' she previously told Glamour. She is said to have honed her super-firm figure with gruelling two-hour workouts, six days a week. Renee is also reportedly a running devotee who covers a minimum of three to six miles every day, happily admitting that she's addicted to the 'runner's high'.

When running in the gym, Renee watches television to keep herself entertained while clocking up the miles, including regular sprint intervals on a treadmill. However, she admits that she does sometimes have a tendency to overdo it. Despite problems with her hip and being warned by her doctor to stop, she had said: 'I run until it hurts.'. Nor does she let travelling or a busy schedule get in the way of her workouts, confessing to MailOnline previously: 'Wherever I move, wherever I'm stationed or whatever phase of life I'm in, the gym is my common denominator.'.

As well as running, Renee uses hiking, swimming, yoga and cycling sessions to tone up her bottom, thighs and, of course, those fabulous calves. The Oscar Winner, 55, is known for her gym dedication and has admitted she even works out on holiday, carefully sculpting her perfect biceps and triceps through 'gruelling two-hour workouts' (Seen in 2020). In a bid to show off her hard work, Renee appears to adopt a 'uniform' of strictly strapless and one-shoulder gowns when she does take to the red carpet (Seen in 2019).

To prepare for her role as dancing queen Roxie Hart in the film of Chicago, she was in the gym every day working on her stamina. She admitted: 'I was using muscles that I never knew I had.'. Fitness expert Iain Reitze, of prestigebootcamp.com, previously told MailOnline: 'The best way to maintain a healthy, fabulous figure is regular exercise and a balanced diet. 'But unlike Renee, for most women, a two-hour workout every day is not realistic. Build cardio into your day by walking or cycling instead of driving, where possible.

'Or try to sprint on the spot as hard as possible for 20 seconds then rest for ten seconds and alternate this repeatedly for four minutes, twice a day. 'This high-intensity exercise can be as effective as Renee's daily three miles, as it pushes you to maximum strength, increases your heart rate and is just as good as running for miles. It will also increase your metabolism, so you continue to burn more calories throughout the day.'.

Weight-training is the most important secret weapon behind Renee's super-toned back and arms. While the star is notoriously secretive about her exact regime, experts have said it would be impossible to achieve this shape without some serious dedication to working out with weights and the help of a committed personal trainer. Renee once revealed 'run until it hurts' is her motto, but also hikes, swims and does yoga and spin classes to stay trim (Seen in 2020).

Renee is said to have honed her super-firm figure with gruelling two-hour workouts, six days a week (Seen in 2020). 'Renee has very defined latissimus dorsi muscles, which are what give her the V-shape that makes her back muscles appear wider at the top and narrower at the bottom,' said Iain. 'She's worked out intensively to achieve this look. To get this defined shape safely, focus on the back muscles at the gym by doing pull-downs using a weight machine.