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by Martijn Dieleman

The Proven System for Mastering Your Inner Game

A step-by-step system built from neuroscience, identity work, and 17 years of research, that takes you from choking under pressure to performing with unshakable confidence. Built by a former Olympic athlete who lived the exact problem and spent nearly two decades solving it.

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The Missing Discipline in Athletic Performance

Pushing through used to be enough. Grit, more reps, “just get out of your own head.” It isn’t enough anymore, not even close.

Sports psychology has gotten more sophisticated. Visualization, breathing techniques, pre-performance routines. Athletes today have access to more mental tools than any previous generation.

And still, the same thing keeps happening. Athletes who’ve done all of it still choke when it counts, still hesitate when they used to trust themselves, still burn out chasing a fire that isn’t there anymore.

You can master every mental technique out there and still freeze on competition day, because none of them reach the layer that actually runs the show.

I didn’t learn this in a classroom. By 21, I’d already won national titles, made my debut for the national team, signed with the Spanish champions, and competed at the Sydney Olympics. Then, right after Sydney, a personal event shattered my confidence. I kept winning on paper for another year, MVP titles included, but underneath it, something had already started to come apart. By 22, the downfall had begun. For years I competed while struggling in silence, without the language or the tools to understand what was happening underneath the surface.

It took 17 years of studying neuroscience, modern therapies, and identity work, applied through 16 years of leading and coaching teams in the corporate world, to find the actual layer that determines performance. Not the mind. The state. Not the thoughts. The identity underneath them.

I’ve now built everything I learned into a system called Becoming The Future You. It combines a step-by-step path through three core transformations, mental rehearsal and breath training, and for those who want to go further, direct coaching alongside me.

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How Becoming The Future You Turns Your Mind Into Your Biggest Advantage

25 lessons across six modules and nine Deep Dives, covering the neuroscience of intention, attention, and emotion, the mental rehearsal and breath training that put it into practice, and the identity work that makes it last, so your best performance shows up when it counts.

1. The Core Curriculum

6 Modules, 25 Lessons, 9 Deep Dives, 1 System

25 video lessons walking you through the neuroscience of attention, intention, and emotion, and how each one shapes the identity you perform from. Structured as three transformations, the Inner Decision, the Inner Alignment, the Inner Embodiment, so the material builds in order rather than sitting as a library to browse.

  • Why change is so hard, and how to break the patterns keeping you stuck (Module 1)
  • Setting a real intention and a clear vision of who you're becoming (Module 2)
  • Directing your attention under pressure (Module 3)
  • The brain states behind focus and calm, and how breath training shifts them (Module 4)
  • Releasing old emotional patterns so they stop running your reactions (Module 5)
  • Making calm and confidence something you embody daily (Module 6)

2. Mental Rehearsal & Breath Training

Turn Understanding Into Something You Can Actually Do

Guided mental rehearsal and breath training practices tied to each module, so the neuroscience isn’t just information, it’s something you can call on in the moment it matters. This is where the material moves from your head into your nervous system.

  • Guided mental rehearsal built into every stage of the system
  • Breath training to shift your state before it matters
  • Techniques to build calm and control under pressure

3. Embodiment Journals

Make It Real On Paper, Not Just In Your Head

Structured journals and reflection exercises for each module, so what you’re learning gets processed and integrated instead of staying as something you understood once and forgot.

  • A structured journal for every module
  • Prompts built to surface your own patterns
  • A way to track how your baseline shifts as you move through the system

4. The 28-Day Embodiment Calendar

Turn What You Learned Into Who You Are

Twenty-eight days to make the elevated state your default, living what you learned long after the last lesson ends.

  • A day-by-day plan for the 28 days after you finish the course
  • Built to carry the practices into daily life
  • Turns knowledge into lasting embodiment
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5. Becoming The Future You Accelerated

Go Deeper, Faster, With Me Directly

For athletes who want more than self-paced. Application only, capped at 10 people. Six weeks, one 1.5-hour coaching session per week, plus a group call open to everyone in the program.

  • Application only, capped at 10 athletes at a time
  • Six weeks, one 1.5-hour 1:1 coaching session per week
  • A weekly group call open to everyone in the program
  • Direct access to me for anyone who wants more than self-paced
  • Coaching is available in English, Spanish, and Dutch

This is for:

  • You're competing now and want an edge you haven't found elsewhere
  • You're dealing with self-doubt, fear of failure, or burnout
  • You're coming back from injury
  • You're an upcoming talent who wants to take the next step
  • You're near the end of your career and want a foundation for what's next

It's not for:

  • You want a quick fix before one big game
  • You're not willing to do the daily work
  • You're not ready to take full responsibility for your life
  • You're not willing to commit and go all-in for at least 28 days
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When You Join Becoming The Future You, You Get:

Full Access to the Core Curriculum

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Mental Rehearsal & Breath Training

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Embodiment Journals

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The 28-Day Embodiment Calendar

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Athletes In The Accelerated Program Also Get:

1:1 Coaching Sessions

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Weekly Group Calls

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Invest in Your Future

Becoming The Future You

$399 One-Time

  • Becoming The Future You full course
  • Mental Rehearsal & Breath Training
  • Embodiment Journals
  • 28-Day Embodiment Calendar
  • Lifetime access
  • Possibility to apply for the Accelerated Coaching program
Join the Waitlist

Join the waitlist to be notified when enrollment opens.

 

Accelerated
Only for Athletes enrolled in Becoming The Future You

$1,100 One-Time

  • Application only, capped at 10 athletes at a time
  • Six weeks, one 1.5-hour 1:1 coaching session per week
  • A weekly group call open to everyone in the program
  • Personal guidance during the 28-Day Embodiment work
  • Coaching is available in English, Spanish, and Dutch
Apply

Please allow 1 week for your application to be reviewed and processed.

 

Join the Waitlist

Becoming The Future You is estimated to open for the first athletes by the end of August 2026. Join the waitlist and I’ll let you know when enrollment is officially open.

Everything you need to know before you join

Yes. Everything inside this course is built on real performance principles and identity work, not on the specifics of any one sport. If what you’ve read here speaks to you, that’s reason enough to be here.

Most mental performance work focuses on your thinking, your self-talk, your pre-game routine. This works one layer deeper, on the identity and inner state that your thoughts and performance are actually generated from. It’s not a replacement for professional support if you need it, it’s a system for the layer underneath it.

This is a non-refundable purchase. If you follow the steps and genuinely commit to doing the work, this works, I’ve built it from what actually changed my own life. What’s in your hands is whether you show up for it fully.

The course itself is self-paced, you decide how much time you want to dedicate to it. But once you reach the 28-Day Embodiment Calendar, expect to commit around one hour a day. No exceptions. Real transformation takes real commitment.

The lessons themselves total around 8 hours, and the pace is entirely up to you, some people move through a few lessons in one sitting, others do one a day. My advice: complete at least one lesson a day and commit fully to the tasks that come with it. And once you finish the course, commit to the 28-Day Embodiment Calendar. That’s where the real integration happens.

You get lifetime access to the course, including any future updates and new lessons, mental rehearsals, or breath training practices that are added down the line, at no extra cost to you.

Yes. The course itself is self-paced, so it fits around your training and season. The one thing to plan for is the 28-Day Embodiment Calendar once you finish the course, that phase asks for around one hour a day, no exceptions, so it’s worth timing it for a stretch where you can commit to that.

No, but you do need to be open to it. Come with a genuine willingness to commit to the work and follow the lessons as they’re laid out, and that’s enough to start.

If you’re open-minded enough to try it, that’s all this requires. If you’re not there yet, this probably isn’t the right time for you to enroll.

Yes. This works for any athlete, in any sport. Team results depend on more than just you, your teammates are part of that equation too, but this course is about your own personal transformation, so you show up and perform at your best regardless of whether you’re competing alone or as part of a team.

Absolutely. Coming back from injury is often harder mentally than physically, the fear of re-injury, the loss of trust in your body, the doubt about whether you’ll return to who you were. This course is built to help you come back with full confidence, not just physically cleared, but mentally ready.

The course gives you the full system, self-paced, at your own speed. Accelerated adds six weeks of direct 1:1 coaching sessions with me, plus group calls with the other athletes in the program, for those who want to go deeper and faster with real-time support alongside the material.

There’s no upgrade process, since Accelerated is application only and capped at a maximum of 10 athletes at a time. If you’re already in the course and want to join Accelerated, you simply apply like anyone else, and you’ll be accepted if there’s space available.

You only pay once your application is accepted, nothing is charged upfront just for applying. If there are no open spots at the time, you’ll be placed on the waitlist for the next available one. If you’re not accepted for another reason, you’ll receive a clear explanation of why.

Yes. Reach out through my contact page, and we can talk through what your team needs, whether that’s a workshop, a group discount on the course, or an off-season retreat to build a shared vision for the season ahead.