"I've gained muscle, strength and managed to sustain this within my busy schedule. Leigh is fantastic at knowing what to focus on at the right time."
Mark Richards
Your health is the most important investment you will ever make
Integrated health and performance coaching in London. Every client starts with a Vitality Profile, a 90-minute assessment across the eight elements of health and performance. From there, training, nutrition, recovery and clinical diagnostics are coordinated into one plan, at UNTIL Marylebone or wherever your week takes you.
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Marylebone & Mayfair
London W1
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In person & remote
Coaching formats
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16 years
Coaching experience
As featured in
Programmes
Performance without
compromise
Our philosophy
“The healthy person is the high-performing person. Everything else follows from that.” The W1 Performance approach
Most approaches treat fitness, health and medicine as separate worlds. We bring them together, with a network of specialists who work as one team around you.
Built for high performers who want it to last
W1 Performance is for people who expect more from themselves and need a system that holds up under real pressure. Most fitness and coaching approaches are built for ideal conditions: plenty of time, minimal stress, perfect routines. They work until life gets busy.
We work with demanding lives as the baseline, not the exception. Our standard is simple: we deliver sustainable performance that supports your ambition, not competes with it.
The methodology
The whole person. Every time.
Our approach looks at every part of who you are, not just what you can lift or how fast you recover. It’s built on the W1 Performance Wheel, and every client is scored across it through the Vitality Profile:
- Purpose & Identity: at the centre, who you are and what you’re working towards
- Strength & Fitness: the training base everything else is built on
- Body Composition: muscle, body fat and how they’re changing
- Movement & Biomechanics: how you move, and what’s holding you back
- General Health: the clinical picture beneath it all
- Nutrition: fuel matched to the demands of your week
- Sleep & Recovery: the undervalued element that determines how well everything else works
- Focus & Energy: how you think, manage pressure and show up
Your life shapes your health. We work with it, not around it.
Clinical partnership
Working with Cedars Sinai physicians
For clients who want the full picture, we work alongside physicians from Cedars Sinai’s London practice, bringing advanced diagnostics, blood work and DEXA scanning into your programme.
Real data. Clinical insight. Meaningful change.
How we work
High Touch Performance Development
W1 Performance operates as a private, one-to-one performance practice.
Every programme is delivered through an ongoing relationship, with strategy evolving as your life, workload and priorities change. Whether it’s a focused Sprint or a long-term commitment, the work is shaped through observation, dialogue and continuous refinement.
In person in Marylebone, remotely between sessions, or alongside you when you travel.
Where we work
Private, premium coaching in the heart of Marylebone. Our sessions take place at a discreet, high-spec private training facility in Orchard Street, London W1. This space is designed for focus, privacy, and performance, without the chaos of commercial gyms.
Whether we’re strength training, running diagnostics, or having a deep coaching conversation, the space allows us to work without distractions and build something truly tailored.
- A partnership, not a prescriptionOne-to-one sessions focused on training, capacity, and performance under pressure.
- Structure that survives a full diaryStrategy that adapts as demands increase, rather than falling apart.
- Recalibrated against real lifeClear structure across training, recovery, energy, and focus, with regular recalibration to keep progress aligned with real life.
Client Results
& Testimonials
Clients coached by Leigh in London, in their own words. Every quote below is published with their name and role, exactly as they gave it.
"I've been training with Leigh for the past 5 years off and on and the skills and habits I've developed over that time have really helped me"
Ellie Baker
"I've worked with Leigh for nearly three years and over that time I have completely transformed. I'm in much better shape and I feel im performing at my best"
Bradley Wright
"Leigh has really helped me develop strength , gain muscle and make fitness a priority in my life"
David Budden
"Leigh is super approachable, attentive and listens to your needs. Can't recommend him highly enough."
Mila Loncar
"Your energy is different — authentic, human, and supportive. I always feel better when I leave."
Amy
About Leigh Clayton
Performance that supports
your ambition, not competes with it
I am Leigh Clayton, founder of W1 Performance and a performance coach in Marylebone. 16 years in this industry taught me something uncomfortable: I watched hundreds of people change their bodies and walk away with deeper problems than they arrived with. The results were real. The methods were one-dimensional, built around 1 gear, and everything underneath stayed untouched.
So I built a practice around living well instead. W1 Performance is a private, 1-to-1 performance practice working from 2 venues in London W1. Every client starts with a Vitality Profile, a full assessment across eight elements of health and performance, and nothing is written before it.
The people I work with are capable and short on time, most often between their late 30s and their 60s. They are not looking for another practitioner to add to a list of 4 who never speak to each other. They want 1 person accountable for the whole picture. Coaching cycles here typically run 2 to 3 years, and many clients have stayed considerably longer.
BSc Sport and Exercise Science
16 years in personal performance coaching
Hintsa Performance Coaching Course (in progress)
OPEX Certified Coach (CCP)
MBSC (Movement and Strength Coach)
Resistance Training Specialist (RTS)
Functional Movement Systems (FMS)
Level 5 BTEC Soft Tissue Therapy
Level 3 Personal Training and Education
O2 Advantage Breathwork Certified
Breathwork Practitioner
Psychotherapy and Counselling
Group Facilitation
Tennis Equipment Specialist and Stringer
How It Works
Your journey,
step by step
Vitality Profile
A 90-minute consultation across the eight elements of health and performance. We understand where you are before anything changes.
Your plan
Within 24 hours you receive a written report and plan of action, built from your results and your goals.
Your programme
We agree the right programme together: Sprint, Build or Sustain, or W1 Black for a fully bespoke service.
Ongoing coaching
Sessions, check-ins and remote support that adapt as your life and workload change.
Review and progress
Regular reviews, agreed with you at the start, to re-measure, review what’s moving, and set the next step.
2 Locations
Visit us in Marylebone, London
- UNTIL Marylebone 1 Orchard Street, London W1H 6HJ
- Common Purpose, Mayfair 10 Stratton Street, London W1J 8LG
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Leigh Clayton Coaching
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FAQ
Common
questions
Where do you coach?
At UNTIL Marylebone, a private members club at 1 Orchard Street in London W1, and at Common Purpose, 10 Stratton Street in Mayfair. Both are discreet, high-spec private training spaces rather than commercial gyms, which means sessions run without distraction. Remote coaching is available worldwide.
Who is W1 Performance for?
Capable, driven professionals who need a plan that holds up under real pressure. Most clients are between their late thirties and their sixties, often founders, executives or investors, and most arrive after something shifted: a health flag, a milestone birthday, or a slow sense of having drifted.
How much does coaching cost?
Every programme is built around you, so investment depends on its length and scope. We’ll talk it through after your Vitality Profile, with no obligation.
How long before I see a real change?
Leigh puts it plainly: twelve weeks to feel a meaningful shift, and six to twelve months to genuinely change. A Sprint can deliver a focused result in weeks, but lasting change is built over time, which is why many coaching relationships here run two to three years.
What makes this different from a personal trainer?
Three things. One person coordinates everything and is accountable for outcomes, rather than four practitioners who never speak. The approach is holistic, covering all eight elements of health and performance through the Vitality Profile. And clinical diagnostics, working with physicians from Cedars Sinai and The Mayfair GP, bring measured data into lifestyle coaching rather than guesswork.
Do I need to be fit before I start?
No. The Vitality Profile exists precisely so the programme starts where you are today. Clients arrive from long training histories and from years away from structured exercise, and both get a first block built from their own findings rather than from an assumed standard.
How do I start?
Every client begins with a Vitality Profile. Get in touch through the contact page or message us on WhatsApp, and appointments are typically available within a week. Not sure yet? A short, no-obligation call of twenty to thirty minutes is always an option first.
Can you work with me when I travel?
Yes. Remote coaching keeps your programme on track wherever you are, and W1 Black clients can have Leigh travel with them.
Get Started
Ready to begin?
Start with your Vitality Profile.
W1 Performance • UNTIL, 1 Orchard Street, London W1H 6HJ
Book your Vitality ProfileAppointments typically available within 1 week