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Jennifer Aniston is known for her gruelling workout routines and staying fit and healthy into her 50s.
But even the fitness-fanatic Friends star, 55, has admitted her 'doesn't want to work out' sometimes.
On Monday, Jennifer took her fans through a few quick clips of her sweat session and ended the video with her collapsing at the end of her push-ups.
'Oh god, you know those days when you just don't wanna do it, you just gotta do it,' she said in the clip.
Long-term followers on the star might be surprised to see the intensity of the star's workout, as she recently said she wanted a change from 'breaking her body' with high-impact cardio.
The LA-based actress uses Pvolve, a low-impact, high-intensity 'functional' work-out programme that involves moving planks (going from a downward dog position to a plank and back again).
Jennifer Aniston has the body of a woman half her age and she shows why in a new workout video
The Friends alum – who turned 55 earlier this month – shook off her case of the Mondays with her Pvolve workout routine
There's also push-ups, leg raises (lying on your back, legs up vertically with knees bent at 45 degrees, stretching alternate legs out horizontally) and single glute bridges , which is lying on your backs, knees bent, feet flat on the floor, raising and lowering our bottoms by pushing through one leg at a time.
She signed up to the programme, founded by New York entrepreneur Rachel Katzman in 2017, in 2021 after 'looking for solutions to keep exercising while facing burn-out from her shooting schedule, rigorous workouts, and a back injury'.
But, to those who aren't gym-nuts, the routine may ring alarm bells for being described as 'low-impact'.
And despite still putting pressure on the joints, the movements are thought of as functional and better for you, a leading personal trainer has explained.
Hollie Grant, Founder of Pilates PT, added: 'She hasn't really alluded a huge amount to what she was doing in the past that has apparently broken her body. It sounds like she was probably doing a lot of cardio and they mention the stair master, but I was presuming they would maybe say things like she did lots of running and things like that.
'Usually, when we think of cardio, we do think of things like running and high-intensity training and things like that, if that is what she was doing, are high impact.
'If you think of the impact that's going through the floor as you land when you're running, you've got the weight of your body plus gravity, which is jarring on your joints, and if you aren't strong and functional, you might find that you struggle with things like pelvic floor issues or joint issues.
The Picture Perfect star wore a black tank top and grey leggings for her barefoot workout which saw her balancing on one leg on a slanted board
'So, it's not that you can't do high-intensity training, and it's not that every single person that does high-intensity training is going to be injured, it's just if that's all you ever do and you don't support your body with muscle strengthening activities as well, then you might find that you put yourself more at risk of injuries.
'But, with regards to what she's doing now, everything I've seen about Pvolve, to me it looks a lot like Pilates, so it's functional training, using various different forms of resistance like bodyweight, small pieces of equipment and so that is low impact, especially those exercises listed in your question above.
'These are not where you're landing on the floor with impact. You're using your bodyweight, or extra resistance to strengthen your muscles which in turn strengthen your joints.
'So, this is lower impact and it's potentially kinder on the body, but again, we can't presume that because something is low impact it won't injure you.
'But I would say that something that is lower impact probably is less likely to injure you than something that's high impact and repetitive, but that's not always the case.
Lewis Paris PT and founder of Lewis Paris Fitness explained that, despite looking intense and putting pressure on the joints, moving planks, push ups, leg raises and single leg glute bridges are considered low impact.
'Doing these types of exercises will further increase the level of control to perform the movement thus increasing the likelihood of isolating the muscle for better mind to muscle connection and strength.
'This will further aid in developing a more aesthetic body, improved range of motion and aid in preventing injury alongside managing and/or strengthening any preexisting injuries,' he added.
'High impact exercises and low impact exercises have their uses for building a strong and well rounded body; being mindful of your goals and what would typically work for you will determine which style of training to focus more on.
'High impact exercises are great for building muscle strength, cardiovascular fitness, endurance and athletic performance whereas low impact exercises can decrease the risk of injury to joints and tendons, improve balance and mobility, maintain fitness levels post injury, increase strength and can be performed by anyone no matter their fitness level.'
She has seen a friend get great results with the programme, and after signing up as an ambassador said it 'completely changed her relationship to fitness'.
'When you're in a mindset of, 'I need to do 45 minutes of cardio or I won't get a good workout,' it's daunting,' she told InStyle earlier this year.
'I believed it for so long. I just burnt out and broke my body.'
'My physical therapist gave me a Barbie doll that's covered in Kinesio tape,' she shared.
'It's a silly mental image until you realise the purpose of all that tape is 'to show every injury I've had in the last 15 years.'
The Hollywood it girl started working with the program after hurting her back two years ago.
And she claims Pvolve helps 'strengthen and restore' her body through its on-demand classes.
'As we get into our lovely older periods, we have to keep it exciting. And we have to be kinder to our bodies,' the Friends vet told People this week.
'If I had known about it 20 years ago when I was breaking my body to begin with, we would've saved so much pain.'
Aniston went to Pvolve founder Rachel Katzman to talk about working together to promote the program.
'I just want more people to know about it because I think it's so good,' the actress added.
'Our minds used to think, we have to hurt; no pain, no gain. It has to be an hour of a workout. You have to work out three times a day.
'With this, you can start gentle,' she explained.
'My girlfriend transformed her entire body, and it just had such a beautiful snowball effect in so many positive areas of her life.'
The Picture Perfect star wore a black tank top and grey leggings for her barefoot workout which saw her balancing on one leg on a slanted board.
If you're having one of THOSE Mondays, I FEEL YOU! Just gotta do it!! ❤️ @pvolve,' she captioned the video
Jennifer took her fans through a few quick clips of her sweat session and ended the video with her collapsing at the end of her pushups
Antony Chris, London-based personal trainer and director of Complex Training, told FEMAIL: It's no surprise Jennifer opted for a shift from high-intensity cardio to her current training regimen.
'While high-intensity cardio can undoubtedly elevate our endorphins, the relentless pursuit of it can also leave us drained and susceptible to injuries from continuous high-impact movements.
'In her recent video clips, Jennifer demonstrates a dynamic fusion of total-body movements in her workout routine. This includes engaging in mountain climbers with sliders, performing standing leg abductions on a slant board with ankle weights for added intensity, and pushing herself through push-ups to failure.
'These exercises effectively challenge the body through its entire range of motion, fostering strength, balance, and flexibility while keeping impact levels minimal and intensity high.
'Despite the apparent intensity of her routine, Jennifer ensures that impact remains low by steering clear of high-force movements like jumping, running, or landing, thus prioritising joint health and safety'.