Caroline Idiens is a global fitness phenomenon. The majority of her express workout videos go viral because they inspire women around the world to get into shape amidst their busy lives. Not surprisingly, she is famous for her project Caroline’s Circuits, which was born out of the COVID-19 pandemic, when many of us discovered the benefits of working out at home.
Contrary to her expectations, those 30-minute strength sessions were a hit and have endured beyond lockdown. The key? A woman who has passed the fifty mark and who works out in the living room of her home, an example many can see themselves reflected in.
That’s why many now can’t live without the famous 15, 20 and 30-minute circuits from this personal trainer for whom exercise is a whole life philosophy. One she wants to share through her express workouts.
With her we discuss her journey, the role that strength training has played in her life, and her experience as an online personal trainer on a global scale.
A Global Fitness Community
-How did you get started in the world of physical exercise?
I’ve always enjoyed sport and exercise in general. At school I played hockey and was an enthusiastic runner. Exercise has always been an important part of my life. At twenty, while working in an advertising agency, my fitness routine relied heavily on cardio, mainly running, spinning classes and high-impact workouts. I loved HIIT.
Then I discovered a 45-minute group class with weights—Body Pump. It was my introduction to weightlifting and, from then on, strength training became my focus. I developed a keen interest in health and wellbeing and had my own personal trainer.
I loved how using weights in my training not only transformed my body but also gave me confidence and inner strength. It completely changed how I viewed my entire routine and I discovered that all the benefits, from posture and daily movement to performance and even sleep, improved as a result.
That sense of empowerment, strength and wellbeing made me want to share it with others. I decided to leave my advertising job and train as a personal trainer because I wanted to deepen this knowledge, from nutrition, sports rehabilitation, prenatal and postnatal exercise, and more.
So in 2001, I qualified in London and started my personal training business with individual clients, often in morning sessions in parks around London, which I loved. When we moved to the countryside, I began teaching group classes at my children’s school for mums, often with 20–30 mums at a time, along with additional local group classes.
-What has exercise meant in your life?
Exercise became something much deeper than merely “looking good.” It became a source of strength: physically, mentally and emotionally. The shift to strength training transformed how I moved, how I stood, how I felt. It gave me a new confidence and the sense that my body was capable of real power and function. Exercise is a constant in my hectic work and family life. I love what strength training did for me and I want to help other women feel it too.
“The idea for short workouts came from something very practical: life is busy.”
-What led you to create your method based on short workouts?
The idea for short workouts came from something very practical: life is busy. As I say on my online platform, many of us simply don’t have time for hour-long gym sessions. Between work, dropping the kids at school, family and errands, we all know time is precious.
I believed—and I still believe—that strength training doesn’t need to be complicated or time-consuming to be effective. With minimal equipment and completing short circuits based on compound movements, you can train strength, cardio and functional fitness in as little as 10 to 20 minutes.
When lockdown arrived, my clients had been lifting weights with me for years and were keen for us to continue—even over a screen! That’s when Caroline’s Circuits was born. That shift allowed me to scale the idea of short circuits to a global level. People could join from their living rooms, without needing a gym, and together we created a community for ourselves.
-When you started, did you imagine you would inspire so many women?
When I began as a personal trainer teaching mums after dropping the kids at school, the group was small: just friends and local clients. When lockdown arrived, I started online classes and subsequently opened an Instagram account to spread the word.
I taught myself digital marketing and how to present online workouts. I was sure people wouldn’t want to exercise on a screen…but how wrong I was! But truly, I didn’t expect it to resonate worldwide. Seeing thousands of women connect week after week, share their progress, their fitness and strength gains, their confidence, their improvements in bone density and being part of this global community has been truly amazing.
There are three women—a grandmother, a mother and a daughter—who complete the Friday class and take on the day afterwards. That’s something I love to hear. While the focus is on movement in midlife, it’s wonderful to see all generations taking part and getting their bodies ready for the future.
-What do you think has been the secret of this success?
My platform, Caroline’s Circuits, is about longevity, strength, mobility and bone health. It’s about real long-term benefits rather than fleeting goals. It’s about a purpose, beyond aesthetics, that truly resonates, especially as women age.
- Accessibility and practicality: my workouts don’t require a fancy gym or lots of expensive gear. They’re just basic dumbbells—bodyweight or even bottles of water—, a mat and perhaps a resistance band. That removes the barrier for many women.
- Time efficiency and realism: they are short, manageable workouts designed to fit into the busy lives of the women who perform them. They can be done live or recorded, between school runs, work commitments, family dinners, etc., so women can actually follow them.
- Identification: I’m a person in her fifties who works out in her living room. I introduce myself to those who join each session, I show up when it’s hard, I say when I’m tired, but like everyone else who has joined that class, I carry on. I listen to my audience—this is what they enjoy about the sessions, knowing I’m there doing it with them.
- Community and support: women come together not just for the workouts but for the connection. Many tell me they feel seen, understood and supported. That sense of solidarity keeps them coming back. They tell me they still feel as if they have their own personal trainer in their own homes, which I love!
-Apart from the physical changes and health improvements, what do you think strength training brings to women?
Strength training offers much more than a toned physique. For many, it’s about confidence and the empowerment you feel when you realise what your body is capable of. I often talk about why we’re waiting for something to go wrong before we start lifting weights and how we should focus our efforts on strength training instead.
Building muscle is about preparing the body for the future and keeping muscles and bones strong helps maintain mobility and reduce the risk of injuries as we age. Lifting weights also provides mental clarity and concentration. For many, it can offer the mental space so needed, and the endorphins released during exercise will last well into the day, helping to stabilise mood and positivity.
-What would you say to a woman who thinks strength is only for men?
It’s for both women and men! Everyone can train for strength at any age. Many women worry about gaining bulk, but this is one of the biggest myths. You will not bulk up like a bodybuilder: lifting weights will develop lean muscle and boost your metabolism, help your bones, improve your posture, and benefit heart and brain health.
My mission today with Caroline’s Circuits is to make strength training accessible and sustainable for everyone and to help people embrace movement as a lifelong ally. Strength is for all. It’s about becoming the strongest and most capable version of yourself.
-And what about those who think they are too old to start training and have never done it before?
It’s never too late to begin and you don’t need to have done anything before. Many of the women in my classes were complete beginners when they started, some in their 50s, 60s and even older. Strength, mobility, bone density and balance respond to training, even in older age.
The important thing is consistency and sensible progression: this is absolutely key to seeing results! I always emphasise starting to lift weights to avoid injuries. Start with bodyweight or 2 kg dumbbells, keep a log of your progress and increase the weights as you build strength. Those last reps should feel challenging. If they don’t, it’s time to up the load.
The Caroline’s Circuits platform is a global community for all ages, where people support one another, share their progress, feel less alone and realise that ageing doesn’t have to mean weakening.
-If you asked for the 4 or 5 strength exercises you could not live without, what would they be?
If I had to pick a few essential exercises that I think everyone should master, they would be as follows:
- The squats: fundamental for lower-body strength and for improving mobility, like getting in and out of chairs and lifting shopping. It’s the best compound movement there is!
- The press-ups (push-ups): ideal for upper-body strength and core engagement.
- The bent-over row (or any pulling movement): excellent for posture, back strength and helping with daily tasks like lifting or carrying.
- Lunges: aid balance, coordination, leg and glute strength and functional lower-body strength.
- Planks: improve core strength, stability and balance.
All of these exercises form basic functional movements that transfer directly to everyday life.
-Tell us a little secret: which one do you hate the most, even though you practice it for its benefits?
There really isn’t an exercise I dislike! I’m even a fan of burpees, but if I had to choose one, it would probably be the “tricep dip” — dips —, but that’s mainly because I enjoy doing triceps kickbacks! Upper-body classes are always my favourite workouts.
-From the videos you share on social media, we know some of your favourite routines. But what’s the real weekly recipe Caroline Idiens follows to stay in such good shape?
My aim is four strength workouts weekly that include functional and compound exercises. This includes a mix of full body, upper body, lower body and a hybrid strength-HIIT class, and I do it consistently. I’m ALWAYS in a better mood after these workouts and my goal is to challenge myself progressively with weights, just as my members do.
Doing sustainable 30-minute workouts that fit into my to-do list has helped me keep going. I’m the first to admit how much I enjoy walking my dogs too. Getting outdoors isn’t negotiable for me. I love being outside with the dogs and hitting my 7,000 daily steps. Alongside movement, I also talk about the importance of nutrition, sleep and mindset. All of this is essential for building strength, recovery and feeding the body properly.
You can find more information in my book, Fit at 50: Your Guide to a Stronger, Fitter, and Happier Midlife in Just 6 Weeks.
