Julianne Hough puts her abs on display in red sports bra as she and brother Derek hit the gym

Julianne Hough and Derek Hough are a pair of Hollywood's most toned siblings.

And on Saturday, the sister and brother who began their careers on Dancing With The Stars were spotted fitting in a joint workout at Pulse Fitness Studio in Los Angeles.

As they left their sweat session, Julianne, 28, flaunted her rock hard abs in a flame-coloured sports bra as her big brother Derek, 31, covered up beneath a grey hoodie.

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Toned siblings! Julianne Hough and Derek Hough were spotted fitting in a joint workout at Pulse Fitness Studio in Los Angeles on Saturday 

She'd slipped into a high-waisted pair of grainy grey sweats that were cut off part of the way down her calves.

The sleeves of her black jacket had been rolled up nearly to the elbow, and she slung along a black non-disposable water bottle.

She accessorised with a round pair of black sunglasses and a black cross-body purse slung from her right shoulder. 

Taut tummy! Julianne, 28, flaunted her rock hard abs in a flame-colored sports bra after her sweat session 

Muted colours: Meanwhile, he'd worn a pale grey tank top and a darker grey pair of shorts that revealed a good deal of his muscled legs

Meanwhile, he'd worn a pale grey tank top and a darker grey pair of shorts that revealed a good deal of his muscled legs.

At one point, the siblings knelt for a large group photo with a host of people who'd appeared to have been working out with them.

Last year, she'd given an interview to Elle and expounded upon her exercise regimen, which she'd said she likes to engage in 'five times a week.'

Ensemble: At one point, the siblings knelt for a large group photo with a host of people who'd appeared to have been working out with them

Rigour: Last year, she'd given an interview to Elle and expounded upon her exercise regimen, which she'd said she likes to engage in 'five times a week'

Though 'I love to start my day off with a workout,' she clarified that 'It doesn't have to be high-exertion, two hours, let's go. But anything that gets me up and going.'

Going into detail, she explained: 'Sometimes it's an hour and a half, sometimes it's an hour, sometimes it's 45 minutes, just depends how I'm feeling on that day.'

Post-workout, 'I usually have some sort of eggs. I like to steam my eggs, and then have tomato and avocado. Look, I'm very specific!'

Working up a sweat: Though 'I love to start my day off with a workout,' she clarified that 'It doesn't have to be high-exertion, two hours, let's go'

'Look, I'm very specific!': Post-workout, 'I usually have some sort of eggs. I like to steam my eggs, and then have tomato and avocado'

Though her fitness routine includes a rigorously healthy diet, she did confess to an occasional indulgence, saying: 'It's funny, I used to be a huge dessert person, but now I'd rather have a glass of wine than dessert.'

The Orem native conceded that 'if I do, I love ice cream. I love like a sticky toffee pudding or something like that.'

Yet and still, 'when I go to my Sunday Funday, I go to the movies usually, so I like Milk Duds and Sour Patch Watermelons. I think that's my go-to candy.'

The workout look: On Saturday, she'd slipped into a high-waisted pair of grainy grey sweats that were cut off part of the way down her calves

Garnishing the outfit: She accessorised with a round pair of black sunglasses and a black cross-body purse slung from her right shoulder

Diminishing sweet tooth: Though her fitness routine includes a healthy diet, she did confess to an occasional indulgence, saying: 'It's funny, I used to be a huge dessert person, but now I'd rather have a glass of wine than dessert'

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