Excuse-proof personal training in the heart of Southampton

Personal Training with an Emphasis on Personal

You are not a cliche. This is not a one-size fits all service.

At One21 I put wellbeing and accountability back in to your weekly fitness routine.

All the benefits of a chain, without any of the gimmicks.

If commercial gyms are not your vibe, but you still want expert advice, top of the range equipment and results that can be created around your schedule, then you’re in the right place.

This is Southampton’s private, bespoke 1-2-1 personal training gym.

Exclusive use of the gym during your session.

No distractions, allowing you to focus on your progress.

Undivided attention of an expert personal trainer.

Get the results you desire, while working around your schedule.

Bespoke training plans and consultations.

Here’s how we can get started today

Starting your journey with One21 Fitness is a simple process. 

1. Get in touch for a no-obligation conversation

Let’s see if I’m just the right fit for you!

2. Choose the frequency and training slot that works for you.

No cookie-cutter packages here! Get a solution that’s designed just for you.

3. Pay monthly, with no minimum commitment.

No one likes a phone contract, so let’s leave ‘locked in’ at the door!

4. Get results with your bespoke training plan.

Using state. of the art equipment and confidence-boosting workouts!

Hi, I'm Aaron

As a personal trainer in both commercial and private settings, I’ve learned a thing or two about what people really want from their personal training experience.

I remember when stepping into a packed gym was a terrifying prospect for me. I used to feel out of place, misunderstood and like I had no idea what I was doing. As I trained as a PT myself, I realised that that’s how a lot of other people feel too.

They want results, they want to look after themselves and they want an environment that helps them to do that, without making them feel inadequate.

That’s what you’ll find at One21 Fitness; a supportive environment where you can feel confident, coached and completely understood.


I was referred to Aaron by my physio after an injury caused by gym training,.

Initially I only intended a short course of PT sessions to learn better form. However, as I quickly realised, Aaron’s breadth of knowledge and commitment to highly tailored training was having such a positive impact that I carried on.

My motivation benefited hugely from the consistent results, but most importantly, I remained injury-free and haven’t needed physio since!

I continue to be impressed by Aaron’s dedication to ongoing professional development coupled with the use of the best equipment where needed, while not over-complicating exercises where it isn’t needed.


One21 Fitness has made a huge impact on my life for the better.

I’ve been training with Aaron, the owner of One21 Fitness, for around 7 years now and the new gym only enhances the experience of training.

Aaron has helped me lose 3 stone for my wedding, when I was suffering with a back injury and didn’t think I’d be able to lose the weight.

He was able to adapt my training to my needs and capabilities at the time, meaning I was able to lose the weight I wanted.

I’m now able to do exercises and lift weights that I thought I’d never be able to do.

He is always expanding his knowledge by completing various courses, including how to safely train pregnant clients, which enables me to feel confident to train with him whilst pregnant.

The new gym allows me to train one to one with Aaron and not feel self conscious of others in the gym. The gym has all brand new high spec equipment which is easy to use with Aaron’s training technique,

Honestly one of the best decisions I’ve ever made was training with One21 Fitness.


I really enjoy my training with Aaron.

He is 100% focused and never fails to motivate and inspire me in every session. I cannot recommend his training methods highly enough.

I have been training with him for 2 years now and honestly, I have been making great progress with my strength level, correct techniques, posture and even my nutrition.

I’ve been losing more in terms of CM’s rather than KG’s – which was my aim!

He has his private gym with the latest gym equipment. He only trains one person at a time and basically, you have a whole gym for yourself to train, which is much safer during these COVID times.


Want to learn more about training with us?

Click the button below to find out more about what training with One21Fitness looks like