“Yinner partnership ensures that people are fit for work and ready for the future.“
Atika Bouz, Projectmanager Gemeente Amsterdam
Stronger health.
Human & AI-coaching – personalised, secure, data-driven and designed for individual and enterprise impact
TRUSTED BY HIGH-PERFORMING ORGANISATIONS
How it works
Yinner empowers professionals and leaders sustainably improve performance through a unique combination of elite coaching, wearables, AI-coaching and data-driven insights.
We translate proven high-performance principles from elite sports into the business environment, helping you strengthen energy, focus, resilience, recovery and decision-making, aligned with your professional goals.
Human Coaching & Training
In-person training & coaching throughout the journey, integrating education, skill building, purpose discovery, and mindset coaching – either 1:1 or in group sessions.
AI-Coach Assistant
24/7 personalized coaching through our platform. Secure, private, personal and fully tailored to your journey whenever you need it.
Wearable & body informed data
An advanced medical wearable that provides insights into your HRV, burnout score, autonomic nervous system, sleep quality and other health data.
What makes Yinner distinctive
Tailored journeys
for professionals and leaders
Elite sports principles
translated into business performance
A holistic performance framework
covering capability, wellbeing and mindset
Real-time data + AI-supported coaching
24/7 available
The outcome
- Stronger leadership
- Healthier, more resilient professionals
- Sustainable high performance at individual and organisational level
Our programs for organisations
Stronger health, better performance, a higher quality of life start with you; build it from within.
For employees, leaders and teams
For Professionals
Take a smarter approach to employee performance.
Pressure is high, but how well are your employees equipped to handle it? To succeed in the long term, they need to reach their peak and sustain it.
Our solution helps employees build resilience and develop the capabilities needed for sustainable health, performance and long-term results.
Through a proven framework, we guide them with a powerful combination of human expertise, AI- and data-driven coaching and training.
For Leaders
Unlock the best in others
Great leadership is about understanding what drives people — and knowing which buttons to press to help them perform, grow and thrive.
At Yinner, we see leading others as a performance discipline. Like elite athletes, professionals perform best when development is approached holistically: skills, strategy, environment, wellbeing and mindset working together.
That’s how we empower you to sustainably bring out the best in others.
Our approach empowers leaders to:
- See what drives performance beneath the surface
- Understand individual needs
- Coach with precision, not assumptions
- Create conditions where people thrive
- Build resilience and self-regulation
- Strengthen capabilities and mental sharpness
For Learning & Development
Unlock the best in others
Master the Future of Learning & Development
Develop the skills to lead sustainable L&D performance.
We help organisations build the capabilities to design, deliver and lead modern Learning & Development, integrating resilience, performance and human capability into leadership, management and employee development.
Our masterclass covers:
- The future of Learning & Development
- Harmonising human expertise with AI coaching
- The role of AI in coaching
- Turning data and wearables into meaningful insights
- The human element in coaching
- Personalised learning journeys at scale
- Blending AI and human coaching effectively
- Biometric intelligence in performance development
Our programs for sports
High performance starts by being the best version of yourself
For elite athletes, coaches and sport organizations
For Athletes
You are at the Centre
At Yinner, everything starts with you.
We guide you on your journey towards sustainable peak performance through a powerful combination of human coaching, continuous AI support and wearable data insights.
You are supported every day to train smarter, recover better and perform sustainably. Yinner helps you unlock your full potential by understanding which “buttons” to press across your performance, resilience and energy.
After the programme, you have the clarity and control to shape your own success and to take full ownership of your performance and career, fully aligned with your goals and ambitions.
For Coaches
Bring Out the Best in Every Athlete
Great coaching is about developing the athlete behind the performance, not about training harder.
At Yinner, we empower coaches to create sustainable peak performance through a single, integrated approach in which skills, health, mindset, recovery, and strategy work together, not in isolation.
Coach the Complete Athlete with Human & Tech
An athlete can have world-class skills and still underperform due to lack of support, poor recovery, stress, pressure or lack of focus.
Our approach empowers coaches to:
- Understand what truly drives performance in each athlete
- Recognise early signs of overload, stress and mental fatigue
- Build resilience and self-regulation under pressure
- Support recovery, energy management and long-term health
- Create a high-performance environment where athletes thrive
AI Data & Insights
Improve Your Coaching Impact with AI-Powered Biometric Intelligence
Move beyond guesswork. Real-time health data and AI analytics give you clear insight, measurable impact and sustained engagement.
Track your health data
- Overall readiness
- Energy status
- Sleep quality
- Burnout risk
- Overnight HRV
What we stand for
Young at Heart
Open-minded, curious, energetic and always developing
Inner Drive
A strong drive to grow and perform at your best
Relationship-Oriented
Building strong relationships and working together
Results-Driven
Focused on measurable, sustainable results
Evidence-based approach
Proven concept
Yinner is a proven concept in both business and sports
Smart automation
We automate and remove unnecessary training and coaching tasks
High-value coaching
Enabling focus on meaningful, high-impact coaching
Measurable impact
Better health, stronger performance and higher quality of life. Less absenteeism, fewer burnouts and more vitality
Our Mission
Yinner helps professionals achieve sustainable performance by combining human coaching, AI-coaching and advanced biometric data into personalised actionable guidance.
What People Say
“Companies should adapt to the future needs of changing job roles. Yinner can help you with this.”
Martijn Willemsen, Field Sales trainer & coach Coca-Cola
“If we want to be the business of tomorrow, we must stop traditional car leasing. We use Yinner to develop for futures roles.”
Marjolein Groen, HR business partner Athlon
“What Yinner does is develop and prepare people. The aim is to prepare people for new roles and be ready and fit for the future.”
Lucas de Vries, Customer service NRC Handelsblad
“Yinner truly knows what a company needs and where the strengths of a person lie. In this way, they can create the best match from a human point of view.”
Yoeri van Alteren, CEO Change INC.
The Yinner method
At Yinner, we support you every step of your journey, from where you are today to where you want to be.
We use powerful structures and holistic principles from elite sports that are universally applicable to people.
With a combination of human & tech real-time performance coaching, data-driven based on biometric data.
Sustainable performance starts with our holistic performance equation, real-time readiness checks, goal setting and personalized guidance to improve your capabilities, resilience and energy on your journey.
Our Team
I’m Coert-Jan Tomassen, Founder & CEO of Yinner. I help professionals and teams elevate their performance in a sustainable way - drawing on proven principles from elite sports. My purpose is to make the insights and methods I’ve learned at the highest level accessible to everyone, so more people can unlock their potential faster, with more focus, energy, and impact.
I am Ellekijn van Vliet, Operational Lead and Coach at Yinner. My passion is guiding people in strengthening their energy and optimizing their performance, based on the belief that peak performance starts with a healthy balance between body and mind. From personal experience, I understand what it feels like when your energy declines and life feels heavier and how you can gradually regain strength and direction, step by step. My goal is to help clients grow sustainably not only during their journey with us, but also in the long term — enabling them to remain vital, resilient, and self-aware for life so they become the best version of themselves.
I am Jelle van Vliet, and my role within Yinner is Business Strategy & Planning.
I am a versatile, people-oriented and entrepreneurial leader with extensive national and international experience in driving sustainable growth through commercial, operational, innovative, and digital transformation. Guided by a clear sense of purpose, I connect strategy and execution in a natural and agile way within Yinner.
With a strong focus on growth, acquisitions, innovation, operational excellence, digitalization, and international expansion I build lasting value for people.
I am a versatile, people-oriented and entrepreneurial leader with extensive national and international experience in driving sustainable growth through commercial, operational, innovative, and digital transformation. Guided by a clear sense of purpose, I connect strategy and execution in a natural and agile way within Yinner.
With a strong focus on growth, acquisitions, innovation, operational excellence, digitalization, and international expansion I build lasting value for people.
I believe that real progress begins when we pay attention to how people feel, think, and grow — and when there is space for reflection, understanding, and conscious choices. To me, innovation is not a driving force, but a supportive one: technology should empower people, not replace them. In my work, I strive to create experiences that feel personal, grounded, and empowering. I see innovation as a means to reduce complexity, not to take control. My goal is to help people gain clarity, strengthen their own decision-making, and take steps that authentically align with who they are. The greatest impact occurs when people remain in control, with technology operating in the background — respecting autonomy, boundaries, and individuality.
Start your journey
Your health and performance deserve a structured plan and measurable results. Start your journey today and discover your resilience and true capabilities.
Book your intake session.
Ellekijn van Vliet
Performance coach
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Ellekijn van Vliet
Performance coach
