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Strength, Mobility
& Long-term Movement Health.

Personal Training and Kinstretch Classes designed to improve how you move, feel, and perform – now and in the future.

Hayley HMJ Fitness About Image

Functional Range Mobility Trainer

At HMJ Fitness, training is about more than just exercise – It’s about building resilient joints, usable strength, and confidence in your body.
I specialise in strength training and mobility development, helping clients move better, reduce aches and stiffness, and stay active for the long-term. Whether you’re training one-to-one or attending a Kinstretch class, every session is purposeful, structured, and tailored to you.
Hayley HMJ Fitness About Image

Hayley Jackson.
Functional Range Mobility Trainer.

My name is Hayley Jackson, and I train clients in my private gym in Lindfield, West Sussex.
I am a Functional range systems trained mobility specialist and Personal Trainer (GP Referral).
I have two young children and a crazy dog who keep me on my toes, so the importance of keeping fit and mobile are incredibly important to me. I follow a plant-based diet for ethical and health reasons, and since doing so, have noticed huge benefits both physically and mentally, including gut health and energy levels.

Strength and mobility training

My passion is mobility training, and although I spent many years weight training, I did sustain a few injuries during this time so when I came across Functional range conditioning, I knew this was the path I wanted to pursue as I realised my body needed a lot of improvement in joint range of motion and strength. After incredible results following this system, I realised I had to use this with all my clients, who also see the same results as I do.
5.0
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Yasmin Lowry
February 1, 2026

We are in our 70’s and have been seeing Hayley for just over a year. We have had fantastic results in that there has been a noticeable improvement in our mobility and general fitness.

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Lesley M. Corbin
January 27, 2026

Hayley Jackson plays at the top of her game in the world of personal training. She is an outstanding personal trainer and fitness coach whose deep understanding of the body allows her to address the root causes of fitness challenges, delivering lasting, systemic results. As a first-class mobility and strength coach, I highly recommend Hayley to anyone seeking meaningful progress towards their fitness goals.

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luci pearson
January 22, 2026

Hayley is an amazing personal trainer who truly cares. From day one, she made me feel supported, encouraged and understood. She has taken the time to look at my individual needs and every workout is thoughtfully planned specifically to me , with varied exercises that that keep training fresh, engaging, effective and a lot of fun. She knows exactly how to motivate me, push me further and she always celebrates my progress and effort. Hayley's constant encouragement, and belief in me has not only changed my fitness levels but also my confidence. Training with Hayley has been truly transformative and I couldn't recommend her more highly.

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Laura Bartlett
January 22, 2026

Hayley is so encouraging, knowledgable and patient and I love that each session is a bit different. She really listens and adapts things to your needs and I couldn’t recommend her more.

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Kirsty Warren
January 22, 2026

I contacted Hayley after years of trying generic personal trainers and using restrictive calorie counting apps, and I've been pleasantly surprised by how comfortable I feel after just a few months. Hayley explains and demonstrates the exercises in a way I can follow and we’ve always started at a pace that’s right for me, gradually building to keep me progressing naturally. I feel genuinely encouraged and boosted by the work we’ve done together.

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Karen Corp
January 22, 2026

I can highly recommend Hayley. She is not only knowledgeable about the body but she is passionate about what she does and genuinely cares about her clients’ progress. My strength and fitness have improved so much, this has been aided by also doing the KinStretch class, which is great for people looking to improve mobility and flexibility. I feel stronger, healthier and more confident, this is all down to her drive, support and encouragement.

Ready to improve how you move?
Whether you’re interested in personal training or joining a Kinstretch® class, I’d love to help you get started.
Let’s work together.
As a qualified Personal Trainer let me help you achieve your personal goals with your fitness and health. What are you waiting for? The only person stopping you from achieving your goals is YOU.

Contact Us

If you have any questions or would like to talk anything through then please feel free to get in contact.
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Hayley Jackson

Hayley Jackson

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