
Achieve lasting results. Our personalised plans empower you to maintain optimal health and performance for the long term.
Our Health and Fitness Optimisation Packages Include
We optimise your health, fitness, and performance like never before
About Us: Unlock Your Metabolic Potential with Theorem Metabolic
At Theorem Metabolic, we understand that your body is not a machine to be run on generic fuel. It’s a complex, finely-tuned system with unique metabolic needs. Achieving optimal health, whether you’re aiming for peak athletic performance, sustainable weight management, or simply a more vibrant and energetic life, requires a personalised approach rooted in scientific understanding. That’s why we move beyond the limitations of one-size-fits-all solutions and embrace the power of data-driven metabolic optimisation.
Born from Experience, Driven by Passion: Meet Justin Johnson, Founder
Theorem Metabolic was founded by Justin Johnson, a lifelong devotee to the pursuit of peak physical condition and a natural bodybuilding competitor for over two decades. Justin’s journey in fitness is not just academic; it’s deeply personal and hands-on. From the demanding trails of mountain biking to the strategic plays of football, and the rigorous discipline of competitive bodybuilding, Justin has lived and breathed the principles of training and nutrition. This extensive experience ignited a profound understanding of the intricate interplay between exercise, diet, and individual metabolic responses – and crucially, the frustration of generic advice that often falls short of delivering real, lasting results.
Witnessing firsthand the limitations of standardised approaches and fuelled by a desire to empower individuals with truly effective strategies, Justin envisioned a different path. He recognised the transformative potential of advanced metabolic insights and cutting-edge technology to unlock each person’s unique potential. This vision led to the creation of Theorem Metabolic: a company dedicated to providing individuals with the knowledge, tools, and expert guidance to optimise their health and performance in a way that is as individual as they are.
The Theorem Metabolic Difference: Precision, Personalisation, and Proven Results
We are not just another fitness company offering generic workout plans or fad diets. Theorem Metabolic is built on a foundation of scientific rigour and personalised data. We utilise state-of-the-art technology and sophisticated AI-powered analysis to delve deep into your individual metabolism, providing insights far beyond the scope of basic assessments or wearable estimations.
Our Comprehensive Approach Includes:
Gold-Standard Metabolic Testing: We offer a range of precise metabolic tests, including Resting Metabolic Rate (RMR) testing to understand your baseline energy expenditure, and VO2 Max testing with integrated lactate threshold analysis to assess your cardiovascular fitness and define your personalised training zones. We also provide comprehensive blood biomarker analysis, offering lipid panels, glucose and HbA1c testing, hormone panels, full blood counts, and liver and kidney function assessments, giving a holistic view of your internal health.
Continuous Glucose Monitoring (CGM): Utilising advanced CGM technology like FreeStyle Libre and Dexcom G6, we provide real-time insights into your blood sugar fluctuations. This allows us to optimise your nutrition strategies, identify individual food sensitivities, and fine-tune your dietary approach for stable energy and improved metabolic health.
Medical-Grade Body Composition Analysis (mBCA): Our SECA mBCA 525 provides a detailed breakdown of your body composition, far beyond simple scales. We accurately measure muscle mass, fat percentage, visceral fat (the metabolically active fat around your organs), hydration levels, and more. This precise data informs targeted strategies for muscle gain, fat loss, and overall body composition improvement.
TSI Muscle Oxygenation Sensors: For those seeking to optimise their training, we utilise TSI muscle sensors with NIRS technology. These sensors provide real-time data on muscle oxygen saturation (SmO2) during workouts, helping to identify muscle imbalances, optimise training intensity, prevent overtraining, and maximise workout effectiveness.
AI-Powered Data Analysis: We leverage sophisticated AI algorithms to analyse the wealth of data gathered from your metabolic tests, CGM, and body composition analysis. Our AI system identifies patterns, trends, and individual responses that would be impossible to discern through manual analysis alone. This allows us to create hyper-personalised plans and continuously refine them based on your ongoing data and progress.
Expert Coaching & Personalised Plans: Data is powerful, but it’s the expert interpretation and application that truly unlocks results. Our team of certified and experienced coaches, with backgrounds in exercise physiology, nutrition, and sports psychology, provide the crucial human element. They translate your data into actionable, tailored workout, nutrition, and lifestyle plans. We offer various coaching options – one-on-one, online, and group – to provide ongoing guidance, support, and motivation throughout your journey.
Real People, Real Results: The Theorem Metabolic Impact
Our commitment to personalised optimisation is not just a theory – it’s proven in the success stories of our clients. Consider Lottie Lamb, a dedicated hybrid athlete already pushing her limits with a demanding training schedule and a seemingly high-calorie diet. Despite her efforts, Lottie was struggling to make progress and felt constantly fatigued. Through Theorem Metabolic’s comprehensive testing, we uncovered a key insight: Lottie possessed an exceptionally high metabolism and was experiencing exercise-induced hypoglycaemia. Her “high-calorie” diet was simply not enough for her unique metabolic demands.
By meticulously adjusting Lottie’s macronutrient ratios and significantly increasing her overall calorie intake (while maintaining a focus on nutrient-dense whole foods), we unlocked her body’s potential. The results were transformative. Lottie gained over 2 kilograms of lean muscle mass while maintaining her body fat percentage, and experienced a dramatic increase in both strength and endurance. This is just one example of how Theorem Metabolic’s personalised approach can break through plateaus and deliver results that generic programmes simply cannot achieve.
Whether you are an elite athlete striving for marginal gains, a dedicated fitness enthusiast aiming for a new personal best, or someone looking to improve their overall health, manage their weight effectively, and feel more energised, Theorem Metabolic is your partner in achieving lasting success.
Ready to Unlock Your Unique Metabolic Potential?
Stop guessing and start knowing. Explore our range of services, learn more about our expert coaching options, and discover how Theorem Metabolic can empower you to achieve your optimal health and performance.
Your Performance, squared²™





Theorem: Weight Loss Goal To Achieve?
Everyone's Biology is different
Knowing your metabolic rate will ensure a better chance of a successful diet with sustained weight loss
Longevity comes from working with your body not against it. Understand the foods that work for you and those that don't. Reinstall the youthful you with lots of energy, restful sleep and enjoy life again. Enjoy life to the full, your journey starts with
Metabolic Testing, Body Composition Analysis and blood work
Justin Johnson Founder - Theorem Metabolic

Crossfitter Chris Reddan Optimised!
Stop guessing, start knowing. Metabolic testing provides the precise data you need to optimise your health and achieve your health and longevity goals.
Resting Metabolic Rate
RMR testing is a simple breath test that measures your resting metabolic rate, providing personalised insights to optimize your weight loss, fitness goals, and overall health.
mBCA Measurement
The mBCA reveals your unique fat-to-muscle ratio and helps identify your exact macros, empowering you to personalize your fitness journey and achieve lasting results.
CGM Measurement
CGM helps people optimise performance by revealing how their blood sugar responds to food and exercise, enabling personalised meal timing and fueling strategies.
Our Opening Times
Visits during open hours are by appointment only, as we will be attending to clients at these times.
Phone or WhatsApp Consultation
Email us to arrange for a call back

Simple testing carried our with results while you wait
Finger Prick Blood Testing
Morning Fasted Test
Male Hormone
£69.00

- 5 minute result time
- 100% Private and confidential
- 8 biomarkers translated for you
Morning Fasted Test
Female Hormone
£69.00

- 5 minute result time
- 100% Private and confidential
- 8 biomarkers translated for you