Spearheading a fitness revolution

We teach and promote an old but largely forgotten approach to fitness and training that simply gets you fitter, stronger and more flexible than you will have been before. Utilising methods of flexibility and strength training from the world of elite level gymnastics but reformulated for everyday adults, our eclectic community of average adults are fast becoming bonafide high level athletes!

Led by a team of highly experienced Osteopaths in Wesley Tan and Claire Berthier, our team of expert instructors are themselves a testimony to the results of the training methods we use. Each one of us has been a student of the system ourselves for at least 3 years and we continue to progress and refine our understanding day by day.

We’re also an educational centre for Health and Fitness professionals, where we run CPD events and workshops ranging from functional anatomy workshops to Teacher Training courses. Our community is made up of members from across the UK and visitors who travel from overseas.

We have members from local areas including Gloucester, Cheltenham and Stroud, and also a growing number of members who travel from Bristol, Bath, Birmingham, Derby & London.

Meet our Team of Expert Instructors

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Our principles are at the core of everything we do



At the heart of Forma lies a genuine passion for helping others. We simply love moving and trying to better ourselves along this journey of life. We practice what we preach and we hope you that a little bit of our passion can be imparted onto each of you.




Our aim has always been to deliver a very professional service for all of our clients and global community. Whether it's our fitness classes, therapies or online content, we hope you find our service thorough, courteous, efficient and of genuine high quality.



Like ourselves, we wish for all of clients to grow into a more capable version of themselves. It is our aim to help you to progress in a safe, step by step fashion. We don't promote quick fixes, we promote sustained growth by consistent self-effort and expert guidance.



We pride ourselves on communicating clearly and delivering a coherent message between our team members. Please let us know if you are unclear with anything during your experience with us at Forma.

Helping guide others to improved health and freedom from pain

Forma was officially launched in May of 2015 by founders Wesley Tan & Claire Berthier when they decided to bring together their pre-existing Osteopathy practice and fitness classes, which had been running since 2008 and 2012 respectively. Our goal from the beginning has been to share our knowledge and passion for health and movement and to help guide others to improved health & freedom from pain.

At the heart of Forma is a passion for quality; we have made a sustained effort to actively seek out the best sources of learning, to practice the teachings ourselves, absorb the lessons and then pass on our experience to the best of our ability. We are fortunate to have studied under some of the most creative and influential individuals in the fields of both gymnastics and dance and to have studied at some of the best institutions in Europe.

In January of 2017 we opened the doors to our brand new, bespoke, fitness gym and educational centre in Gloucester. We now provide over 31 weekly fitness classes based on gymnastics and dance training across two sites in Gloucester and Stroud, and have a fantastic team of 12 Coaches who continue to progress in their individual training and guidance of others.

Try some classes with our introductory Starter Pack - £40 for 5 classes