Title #2

Opening hours

Mon 06:00 AM-09:00 PM
Tue 06:00 AM-09:00 PM
Wed 06:00 AM-09:00 PM
Thu 06:00 AM-09:00 PM
Fri 06:00 AM-09:00 PM
Sat 09:00 AM-05:00 PM
Sun 10:00 AM-03:00 PM

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About Us

Fully Equipped Gym and Old School Body Building in Belfast

Flex Gym NI is a modern, fully equipped gym in Castlereagh and easily accesible from the rest of Belfast. We have all the machinery and equipment required to get you into shape and keep you in shape.

Flex Gym NI is bringing back old school bodybuilding to Belfast and fitness to your doorstep.

All our staff are fully trained personal trainers and are passionate about fitness.

We provide bodybuilding and fitness training in Belfast, including:

  • Strength and conditioning
  • Weight loss
  • Health and wellbeing
  • Diet plans
  • Body building show prep
  • Old school body building
  • Kettle bells
  • Resistance machines
  • Free weights
  • Bar bells and dumb bells
  • Cardio machines


Our gym is fully equipped with a large selection of equipment, allowing our members to train without having to wait around.

Flex Gym NI provide professional, fully qualified personal trainers in Belfast and provide 1 to 1 training and group training sessions, if you decide to train with a friend.

  • fitness and bodybuilding training includes:
    • Strength and Conditioning:

      We provide expert strength and conditioning training.

    • Weight Loss:

      We provide expert advice and training to help lose weight and increase fitness.We run 6 and 12 week SHRED the weight transformation programs.

    • Health and Wellbeing:

      We are expert nutritionists and advise our members on what to eat to increase their health and wellbeing. We believe that having the correct diet promotes health and wellbeing and deisgn bespoke diet plans to suit your lifestyle.

    • Bodybuilding Show Preparation:

      We provide bodybuilding show preparation training and advice.

    • Fitness Training:

      If you are looking to run a marathon or just get fit and shed a few pounds, we can help. We design bespoke fitness training programs to suit your timescales and required results.

    Fully Equipped Gym in Belfast:

    Flex Gym NI provide a fully equipped modern gym in Belfast with all the equipment needed to get your body into shape, including kettle bells, resistance machines, free weights, bar bells, dumb bells, cardio machines, etc.

    Old School Bodybuilding Training:

    We provide old school bodybuilding training in Belfast.

    Personal Trainers in Belfast:

    We are expert personal trainers in Belfast and provide professional personal training services.

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