About Belief.

About Belief Boutique Gym

Eric and Josie have made a commitment to bring Killarney the most innovative and on trend health and fitness. They continue to do this by evolving every year. Following their dreams and leaving Dublin in 2013 to set up Belief Gym has been their best achievement to date.

Both having worked in Management roles in Sports Ireland Campus Dublin including event management, while also coaching a multitude of classes over the years along with vast amounts of experience in personal training with every client imaginable from disabilities right through to elite athletes. They have acquired a wealth of education and knowledge to give to their people.

Both are qualified Life Coaches , this brings an innate ability to work with all clients inclusively and assist them towards whatever goals they may have in life.

" Be Limitless"

Both are CrossFit competitors at local and national level. They thrive on challenging themselves and they believe that instilling belief in their members is imperative to their progress and self achievement in every area of their life!

Our Trainers

Josie McDonnell

Co-Owner

☆ National Diploma /Degree in Science and Health & Leisure Management studies (Tralee IT)
☆ Personal Trainer NCEF specialist
☆ Diploma in Life and Business Coaching
☆ CrossFit Level 1 & 2 Coach
☆ Anti Gravity Yoga Level 1 & 2 Teacher Certified
☆ Numerous qualifications in fitness such as suspension trainer, swim teacher, Spin, Boxercise, Kickboxing, Rebounding & more.

Having always been involved in sport from a young age , I loved the way working out made me feel, the escapism of it all , the clarity it brings! I also loved the community vibe and spirit of sport and the social aspect of it all! A sense of "Your in this together" with your team!

Setting Up Belief and working with people in a positive environment with good music and a social outlet keeps me ignited everyday! I know this sounds cliche but I love what I do, I'm passionate about health & fitness. I feel my soul purpose is to assist people in whatever way I can to be fit, healthy , Happy with an all round balanced approach to life!

What I love the most is seeing how empowered people feel after a great workout or achieving things they never thought they could!

Instill Belief in your people to take on or overcome any challenges life may throw at them

Eric McDonnell

Co-Owner

☆ National Qualification in Exercise, Health Studies and Personal Training (EQF)
☆ CrosssFit Level 1 & 2 Coach
☆ Aerobic Capacity Certified
☆ British weightlifting certified
☆ Life and Business coaching Certified
☆ Numerous other fitness qualifications, such as TRX, Spin etc

Eric has a wealth of experience in the fitness industry. He has aligned himself with sports and Fitness for an extensive period of time and from a very young age.

A unique addition to his qualifications is his lifecoach certificate, Eric feels this a valuable tool especially when working 1 to 1 with people. Eric competes in CrossFit finishing inside the Irish top 10 in the CrossFit Open 6 times. He has a great passion for what he does and is head of programming for belief. With the programming his goal is to create a sustainable programme that people will enjoy and reach their personal goals.

"In order to be successful, I'm a believer in having my beliefs in harmony with my actions, people watch & learn more from what you do, as much, if not more, than listen to what you say."

"The ability to align my words with my actions is key to building trust with others, and to be a good Coach."

"Practice what you preach, Behaviour Never Lies!"

Ian Flynn

MNU Certified Nutritionist, Certified Level 4 Personal Trainer and Fitness Coach, Certified Neuromuscular Physical Therapist

☆ Fat Loss
☆ Muscle Development
☆ Body Confidence
☆ Nutritional Programming
☆ Conditioning
☆ Injury Rehabilitation


As an avid sports and fitness person I have a keen interest in all types of exercise, training, nutrition and health. I believe exercise and nutrition are not just ways to stay in shape and look good, but a way to build a strong base to improve the way we live, feel and enable us to better ourselves whether that is in everyday life or for a specific sport/activity.

My goals are to educate people with up to date evidence-based nutrition and to improve people’s quality of life through active participation in regular fitness activities with the integration of guided fitness programs to make your goals become a reality.

Micheal O Shea

Teacher, CrossFit Coach and Competitor.

☆ Masters in Education University of Limerick
☆ CrossFit Level 1 Qualification
☆ Qualified Swim instructor and Lifeguard
☆ Aerobic Capacity Qualification
My fitness journey began with running, football and swimming but nothing could compare to the experiences I've had since I joined the CrossFit classes in Belief back in July 2015.

I began training under Eric and Josie and quickly became fanatical about CrossFit, I obtained my qualification to coach in 2016 and ever since I've immersed myself in learning as much as I can about all aspects of Fitness.

I'm very passionate about education and coaching whether it's in school or in the gym.

As a coach there's nothing more fulfilling than working with someone towards achieving a target. Belief has an empowering atmosphere, when you join a class you're working alongside a group of like minded people, with everyone chasing their own goals. I think that's what makes this gym so special, once you join you'll never look back.