in Sandyford, South Dublin


Recognised as top personal trainers in Dublin, Custom Fitness will help you reach your physical goals step by step, and teach you how to maintain those achievements.

Due to COVID-19 we now offer one-to-one Personal Training via zoom.

All you need is a phone / tablet / computer.

We can train you from home or in your gym.

Book a free consultation to find out more.


You'll get out of it what you put in... and so much more!

Getting in shape shouldn’t be gruelling, and it needn't be boring.

...It should be addictive.

...It should motivate you by showing you clear progress.

...It should improve your quality of life, physically, mentally and emotionally.

...It should make you realise how awesome you really are, and inspire you to challenge yourself in other aspects of life.

...It should make you feel great! And while there may be a sore muscle or two along the way, the amount of joy and the energy levels you will experience will far exceed any discomfort.


Keith is one of the best PT's in the business. Always pushing you to achieve your fitness goals but great for a chat too and genuinely cares about the wellbeing of his clients.

Tadhg Walsh (GAA player, MMA fighter)


What We Can Do For You


1-on-1 coaching.

30 minute and 60 minute sessions with customised training and nutrition that evolves with you each week.


Free up your schedule

Custom workouts and nutrition delivered via our app, where you will also note your results for me to see. We will also have a weekly check in for feedback and questions. More info here

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Hybrid personal training is perfect for those who want the convenience and budget of online training, but also need some one-to-one coaching.


To arrange small group training or partner training, please get in touch by clicking below.


My name is Keith Grainger and I am the owner of Custom Fitness.

I began lifting originally for injury recovery.

Starting to lift weights coincided with a difficult time in my life, and I found that overcoming challenges in the gym helped me overcome challenges in life outside the gym.


I had long held a goal to help as many people as possible to be happier in themselves, but I didn’t know what form that would take.

When I studied personal training I began to see the ripple effect that good coaching could have on someone's whole life and I knew this was the vehicle for me to achieve my goal.

Since then I have coached all kinds of clients to many different goals including fat loss, strength gain, muscle gain, rehab, general physical/mental health and more. See the testimonials page to read what people are saying.

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Southside Gym Sandyford, 22 Spruce Avenue, Stillorgan, Dublin.