They're commonly used to bake biscuits, but the humble baking tray can actually help you lose weight.

Personal trainers and husband and wife duo Sharny and Julius Kieser have shared a video of a six-minute full-body workout - using two baking trays in place of gym equipment.

Mrs Kieser told Daily Mail Australia if the workout was done everyday it would only a few weeks to start seeing results.

Ab slider: Persona trainers Sharny and Julius Kieser have released a video that shows you how to do a full-body workout using two baking trays

Mountain climbers: The trays are placed under the hands or feet allowing you to slide across the carpet

Lateral slider: The workout shows a series of six exercises, including hamstring sliders, that are performed for one minute each

'You would start seeing results in a few weeks in terms of fitness,' she said.

'By eight weeks time you would have a major difference in body tone.'

And when it comes to working out at home, baking trays are just the beginning.

Hamstring slider: Mrs Kieser said anyone who did the workout everyday would notice a change in their fitness levels after two weeks

Working up a sweat: After eight weeks of doing the workout daily you would see a change in your body tone

Muscle mass: But Sharny says that when working out at home, baking trays are just the beginning

Bath towels, pillows, tins of spaghetti and drink bottles can all be used as workout equipment, saving you time and money on expensive gym memberships or weights.

The baking tray video showed Mr Kieser perform ab sliders, lateral sliders, knee tucks, mountain climbers, hamstring sliders and sliding lunges by placing his hands and feet in the trays and sliding across the carpet.

Each exercise is performed for one minute each.

Fitness duo: Mr and Mrs Kieser share workout videos and fitness tips online and have a number of books

Home workout: Use pillows or towels for an uneven squat (left), or a mop bucket for a bicep curl (right)

The video of the simple workout has since gone viral, with more than 46,000 views since it was uploaded on Monday.

'We have to try these when we are to broke to afford gym membership,' one person wrote.

Others voiced their concerns that a baking tray would scratch their tiles or wooden floors - but Mrs Kieser had a solution.

'People who don’t have carpet, who have wooden floors and tiles, you can use socks on your hands and feet to do the same sort of movements,' she said.

'You could even use hand mops and clean the floor at the same time.'

A common exercise performed at the gym is tossing a medicine ball from side to side.

Mrs Kieser said you could perform this exercise at home using a pillow.

'It's not about the weight ... but about the way you do the movement,' she said.

Body weight training: You can perform a pull up by hanging underneath the table

Training together: 'You don't need expensive gym equipment, you don't need a gym,' Mrs Kieser said

Towels or pillows piled on the floor can be used to perform an uneven squat that allows you to activate your core and leg muscles.

Another trick is to use tins of spaghetti or bottles of water as hand weights or to lay under the table and perform pull up.

'You don't need expensive gym equipment, you don't need a gym,' Mrs Kieser said.

Multi-tasking: Mrs Kieser is known for her fit approach to pregnancy and was pictured exercising while breastfeeding her two-week-old son

Transformation: The Queensland resident is a mother-of-six who previously gained 30 kilograms during pregnancy (left) before taking a fit approach to pregnancy (right)

Mrs Kieser, who is a 35-year-old mother-of-six, is known for her fit approach to pregnancy.

The Queensland resident has previously gained 30 kilograms during pregnancy, and plagued with severe morning sickness and post natal depression, vowed to make a change.

Through what she calls a 'fit pregnancy' - exercising regulalrly and eating well - Mrs Kieser said she had no morning sickness or post natal depression.

Check out the workout video here

A photo of a woman exercising while breastfeeding, or breastercising, is going viral—it's definitely genius, but why is this workout move eliciting so much hate?

Kieser dubbed the move "breastercising," and we're in favor of both the act itself and the term given to it, provided it's carried out in a safe way. After all it is so easy for parents to neglect their own bodies and needs in the first few years and we think it's incredibly important for moms to keep up with the things that make them feel great. If you can get in a workout while also taking care of your child, what could be wrong with that?

But viewers of this picture don't all feel the way we do. Naysayers were quick to criticize Kieser, who is a personal trainer, for not focusing solely on breastfeeding. The comments below the photo include things like: “Cut the multitasking crap for 10 and enjoy the one-on-one time with your child. We are/were all busy mums but I think our children deserve us to be completely in the moment with them.” And: “I honestly don’t understand why it’s necessary to exercise whilst breastfeeding? Is it even comfortable? Can you concentrate on doing the exercise properly?”

But Kieser defended herself against the hate. “A lot of people think it’s gross or strange or that I should be bonding with Magnus, but I feed six times a day, I’m not exercising every time and when I do I’m also watching the kids ride around on their scooters and play outside,” she told the Daily Mail Australia. “It’s not like I’m running or leg-pressing or doing weights, I’m doing squats and lunges as they are the easiest things to do while feeding. Then at night we sit quietly and feed.”

We say that as long as Kieser is keeping her kids safe, she's not doing anything wrong by taking some time to do something that's good for her own health. And beyond that, it's high time women stop judging other women for the personal decisions they make for themselves and their families.

What do you think of this?

A proud husband’s photo of his wife working out has sparked controversy on Facebook because it shows the mother-of-six doing lunges while simultaneously breastfeeding in a maneuver that he hashtagged, #breastercising‬.

“I caught Sharny multitasking today. In public. ‪#‎breastercising‬,” Julius Kieser, an Australian personal trainer, wrote on Facebook in a caption of the image posted Jan. 26, revealing his wife exercising while nursing their 2-week-old son, Magnus. “I don’t get the whole breastfeeding in public problem. It’s not disgusting at all.”

Sharny breastercising‬ again, alongside a few of her children (Photo: Facebook/Sharny & Julius)

The 35-year-old mother, also a trainer, offered an explanation the following day. “A lot of people think it’s gross or strange or that I should be bonding with Magnus, but I feed six times a day, I’m not exercising every time and when I do I’m also watching the kids ride around on their scooters and play outside,” Sharny told the Daily Mail Australia about the controversial photo. “It’s not like I’m running or leg pressing or doing weights, I’m doing squats and lunges as they are the easiest things to do while feeding,” she added. “Then at night we sit quietly and feed.”

Sharny at 39 weeks pregnant with her sixth child (Photo: Facebook/Sharny & Julius)

Exercising, after all, is nonnegotiable for the self-described “Fit Mum” who runs fitness programs and penned the Healthy Junk cookbook, inspired by her own journey losing the roughly 66 pounds she’d accumulated after her first three children. “I felt like a terrible mother, and that it was just going to be this way forever until something externally changed for me,” Sharny writes on her website. So in the 12 weeks after she welcomed her fourth child, she said she dedicated herself to getting in shape — and lost 52 pounds. “No longer was I afraid of exercise, I learned to LOVE it.”

Sharny before and after her slim down (Photo: SharnyAndJulius.com)

Then after welcoming her fourth child, the fitness guru told Daily Mail Australia in 2015 that she had another “enough is enough” moment,” when she looked at herself in the mirror and “was like, ‘Oh my god, who has eaten Sharny?’ I felt like this fat old woman and that’s how I saw myself … It was all in my head but I just felt miserable.”

So for her fifth and sixth pregnancies, the mother got serious about staying fit while she was expecting, to help shed her baby weight more quickly afterward. “Walking, squatting, and doing things makes me feel better and feel good,” she said, adding, “With Hugo, my fifth child, I waited a few months before exercising again and it was much harder. If I wait less time I bounce back faster.”