Our unique offering of Pilates and Functional Conditioning is a fundamental part of Zen-Strength

"It is our intention that our clients learn, experience, benefit from and master zen-strength through their training, and it is our sincere desire that this zen-strength extends to all areas of their lives." 

- Kathryn De Vos Siebert (Zen-Strength Founder-Owner)

We believe The Pilates Method provides an optimal foundation for zen-strengthThrough Pilates we develop focus, control, composure, improved breathing and posture, heightened body awareness and confidence, joint mobility and muscular flexibility, lean muscle tone and endurance, and strength and stability of our core and joints - to name but a few benefits. At Zen-Strength we extend the value of Pilates with a Functional Conditioning ethos. 

"Integrating Functional Conditioning with Pilates is highly effective. The combination has an expansive effect on our zen-strengtheveryday function, longevity and athletic endeavours." 

- Kathryn De Vos Siebert  (Zen-Strength Founder-Owner)

Functional Conditioning is individualised but largely focuses on functional mobility, strength and power. This type of training improves our balance, stability, coordination and postural endurance. It effectively translates into our static postures whilst standing or sitting, or our dynamic postures whilst walking, climbing stairs or performing a myriad of everyday activities. Combining advanced Pilates and more dynamic Functional Conditioning stimulates and challenges an athlete both physically and psychologically - translating into improved athletic performance.

We consider both Pilates and Functional Conditioning to be key components of general health and fitness, injury prevention, injury rehabilitation  and athletic performance, and as such we welcome all ability levels and age groups.

At Zen-Strength we strive to achieve optimal results that leave you energized, confident and strong.

Our clients benefit from a unique training experience - we engage, strengthen, stretch and challenge our clients by incorporating the
dynamic instability of spring-loaded Pilates equipment, elastic-loaded stretch cords, gravity-loaded free weights, the suspension trainer, balance pads, foam rollers, bosus and various fitness balls.

In our custom-designed, well-equipped Pilates and Functional Conditioning Studio at Zen-Strength we offer Private Training and Semi-Private Training. Water and sweat-towels are provided. 

We bring a mobile version of Zen-Strength Pilates and Functional Conditioning to the promenade, beach or park, or to your home, hotel room or office space. The level and content of these classes are designed with your unique needs in mind. Mixed packages that combine 2 or more Zen-Strength services can be arranged.

For pricing options please visit our RATES page.

For further information and bookings please CONTACT us. 


We specialise in highly personalised service with the goal of tailoring specific training regimes to suit our client’s individual needs and goals. Whether you prefer training in a boutique studio environment or in the comfort of your own home, we’ll help you achieve your desired results. We have extensive knowledge and experience in postural and muscle imbalance correction, strength conditioning, performance enhancement training, injury prevention, injury rehabilitation, and post rehabilitation.


Jamie is a certified Personal Trainer, Renee Watson Pilates Instructor, Sports Conditioning Coach and Holistic Massage Therapist, with 19 years of experience working in the health and fitness industry. Jamie joined the Zen-Strength team in 2017 and currently offers Pilates, Functional Conditioning and Therapeutic Massage. 


Braeden has an honours degree in Biokinetics. He is also a certified Pilates Instructor and Sports Massage Therapist, with 5 years of experience working in the health and fitness industry. Braeden joined the Zen-Strength team at the beginning of 2021 and currently offers Pilates, Functional Conditioning and Therapeutic Massage.


Michal has an honours degree in Psychology. He is also an authorised meditation teacher in the Shambhala tradition, and a BASI certified Pilates instructor. Michal joined the Zen-Strength team in 2020 and currently offers Pilates and Functional Conditioning. 

For more information about Kathryn, Jamie, Braeden and Michal please visit our PRACTITIONERS page.


"Without a doubt joining Zen-Strength has been one of the best choices I’ve made on my journey to well-being. Kathryn and Jamie are incredible instructors, their knowledge of Pilates and ability to customize to every client in the studio is amazing. I’ve been training with them for over 4 years now and I’m still learning and feeling challenged. They maintain a safe, fun and challenging environment and I cannot recommend them highly enough. Trust me you will feel a difference!" - Vanessa Westwood (Product Development Manager - for import company) 

"Kathryn is the best recommendation I could ever make! She is totally passionate and incredibly knowledgeable about the body! I look forward to my twice weekly sessions with Kathryn and refer to Zen-Strength as my 'happy space.' " - Candice Jacobson (Psychiatrist)

"I have been training with Jamie and Kathryn for well over 3 years and was very excited when they moved to their own premises.  In the last year I've upped my training program to 3 sessions per week with Jamie and the results have been phenominal. With the help of Jamie, I've improved my strength and flexibility to the point where I am virtually injury free and can enjoy my long distance running more. Sessions with Jamie are relaxed, but always challenging.  I am a firm believer in being challenged and Jamie does that in each session I do with him." - Hennie Coetzee (Accountant / Business-Owner)

"I have been training with Kathryn since my son was born 6 years ago. Kathryn is always inspiring and every workout is challenging, creative and fun. My body at 41 is far better than in my 20’s. I am taller, straighter, leaner. I look in the mirror and I see definition, tone and strength. The focus on balance work and instability training means I avoid injury. I love the variety of equipment we use – no two sessions are ever the same. Kathryn is incredibly focused and present – always alert for the slightest response or lack of form, so you can forget about slacking! My twice a week sessions with Kathryn are a non-negotiable in my life." - Josie Hill (Data Strategy at an investment bank)

"Pilates at Zen-Strength has been a positive addition to my life. Before experiencing a class with Jamie and Kathryn I almost gave up on pursuing Pilates further due to the inconsistencies of the instructors I had experienced. When I met the Zen-Strength team, I knew I had found a place in which I could stay and grow. I learned to love Pilates so much it was the first time I was able to commit to something and actually love what I was spending my time on. What makes Zen-Strength special is the individual, tailored attention you get when you walk in. The group classes are small (with a maximum capacity of 5), which ensures you get individual attention throughout the class. The exercises are tailored for your specific needs and level, irrespective of who else is in the class. Zen-Strength instructors get to know your body, they respect it and they go on the journey with you - to make it the best it can be for you! And I love that! I feel the difference having done Pilates with them since 2015, and I can definitely feel it when I've missed a class! I always come away from Zen-Strength feeling rejuvenated, stronger, better aligned and balanced." - Aneesa (Risk Assurance Senior Manager)

"I joined Zen-Strength nearly 2 years ago because I was told during a Discovery Vitality assessment that my flexibility was concerning to say the least. Kathryn and I clicked off the bat, she customized a training program for me that got me more flexible that I’ve ever been in my life, in record time. Since we reached the initial goal of getting me flexible we have been focusing on core strength and balance work, I am in the best shape of my life and enjoy training more than ever. Just turning 40 years old, I think this routine will keep me agile and injury free for much longer. I recommend Zen-Strength to all my friends and colleagues. If you want to see results training in a clean quiet space at your own pace, this is the studio for you." - Shaun Westwood (DJ) 


"I’ve been doing Pilates with Jamie for almost 3 years now, and I believe he is one of the most experienced and committed Pilates instructors around. Jamie is focused on helping me achieve my goals and makes every session challenging (and somehow fun). My fitness has increased noticeably and I’ve seen real improvements. I came to Jamie with a few injuries and as such he ensures that my technique is always correct to avoid any further injuries. He is extremely reliable and punctual – and always set up and ready to start training ahead of time, with a routine planned. If motivation, flexibility, and a personal approach is what you're looking for, then Jamie is the man for you! Zen-Strength is a professional outfit I can highly recommend." - Heidi Dahl (Director)

"As someone new to Pilates, I’ve found that after 15 sessions with Jamie my postural muscles are much improved and my back and neck feel much better. Jamie is an excellent teacher - very encouraging and gives just enough information on why an exercise is important. Jamie and Kathryn have both also given me lots of useful tips on dietary and general health issues. Highly recommended studio!" - (Lawyer)

"I started with Michal as a Pilates instructor at the beginning of the year. He has the most calming, gentle nature and exudes this energy in every session. I recently completed Michal’s 6 week mindfulness based resistance training - which, I can honestly say, has changed me as a person. The course brought a sense of enlightenment and lightness to my life and it was amazing to be taught by a person who practices what he teaches in his daily living." - Lindsay Stern 

"I have been training under Braeden’s supervision, since he took over from Kathryn when she went on maternity leave. Braeden is a quiet, gentle young man. He is always pleasant and approachable. Braeden follows my training protocol and knows exactly what I require. I have continued to grow stronger under his tuition and I always enjoy my classes with him." - Pat Jacobson.