OPTT — Core Four REWIRED | Biological Performance for Founders, CEOs & Entrepreneurs
OPTT — Core Four REWIRED

You know there’s
more in you.

Your body used to keep up. Now it’s the thing holding you back. You’ve tried everything your doctor suggested. Nothing stuck. There’s a reason for that.

Start the Core Four Assessment →
400+
Programmes
90
Days 1-on-1
5,000+
As physio
Alex Parengkuan — Founder OPTT
Sound familiar?

You’re not
imagining it.

  • Your bloodwork is fine. The scans show nothing. And yet you wake up tired and go to bed wired.
  • You run on adrenaline and call it drive. Somewhere you know that’s not sustainable.
  • Your focus used to be your edge. Now meetings drain you. Decisions take longer.
  • You’ve tried better sleep, less alcohol, more exercise. It helps for a week. Then you’re back.
  • You’re present at home in body. But the people close to you can tell you’re somewhere else.
  • You’re still performing. Just not at the standard you set for yourself.
  • And quietly — you’ve started to wonder if this is just what getting older looks like.
The real problem

It’s not your
discipline.
It’s your biology.

Here’s the thing nobody told you: everything you’ve tried has been aimed at the wrong level. You were solving the symptom. The cause is deeper.

And there is a specific order that matters. Almost nobody starts in the right place.

01
The Cell — Light, Water & Magnetism
Your body was built to connect with the earth. Modern life broke that connection. Office lighting, screens, constant stimulation — they disrupt your biological clock at the cellular level. This is where everything starts. And almost nobody looks here.
02
The Stress Response — Regulation & Recovery
A nervous system stuck in overdrive poisons everything downstream. You can’t sleep your way out of it. You can’t exercise your way out of it. Until the nervous system learns to regulate, nothing else works properly.
03
The Biomechanics — Structure & Movement
This is what everyone jumps to first. Physio. Posture. Movement. It’s the third step — not the first. That’s why it keeps not working.
“In 2019 I was diagnosed with multiple sclerosis. Within weeks, every symptom was gone. The MRI still shows MS. I take no medication. To this day. What I do for my clients is exactly what I did for myself.”
Alex Parengkuan — Founder OPTT

Physiotherapist from 2007. Head therapist at Neptunus Baseball — six national championships, three European Cups. 400+ individual programmes. More than €150,000 invested in education and training.

Results

What changes when you
stop treating the symptom.

“From drained and disengaged to sharp. Back to performing at the standard I hold myself to.”

Dennis Kuipers — Founder AnyLinQ BV

“Thirty years of back pain. Tried everything. After 90 days — pain-free. And off my diabetes medication.”

Piet Hoenderop — Director

“A complete reset. Of myself. Of how I show up.”

Elbert van Dalen — CEO

“Better sleep. More energy. Focus back. And the chronic pain is gone.”

Lisette Spork — Entrepreneur
Core Four REWIRED

90 days. Fully
1-on-1. Nothing added
to your schedule.

Most programmes pile more onto your plate. This one removes what’s draining you. Every week — a live, personal session with me via Zoom. No group. No modules. No catching up.

0
Biological Baseline — 90 minutes
Not a general health check. A precise read of your specific situation — environment, sleep, water, blood and gut.
1
Your Plan
Written specifically for you. What you do when you wake up. How you adjust your environment. Not generic. Not a template.
2
12 Weekly Sessions via Zoom
Every week, live, with me. We implement step by step. We adjust as you progress. WhatsApp access throughout.
3
Measurable Results
We track energy, sleep, pain and focus. So you don’t just feel it — you can see it.
Time required
45–60 min per week
The changes you make aren’t added to your day — they replace how you do things you already do. Most people report getting more back than they put in.
Fully remote
Zoom + WhatsApp
Blood and gut tests arrive by post in week one. Direct WhatsApp access for the full 90 days. No commute. No scheduling gymnastics.
Is this for you?

This is built for
one type of person.

This is for you if
  • →You’re a founder, CEO or entrepreneur (35–60)
  • →You’ve tried the standard solutions — none of them stuck
  • →You can feel your body is no longer keeping up with what you’re building
  • →You’re willing to commit fully for 90 days
  • →You’re willing to be brutally honest with yourself
This is not for you if
  • →You want a quick fix
  • →You want self-paced content
  • →You’re not willing to change your environment or habits
  • →You believe the answer is just working harder

“I can’t do this for you. I can show you how. If you do what’s needed, the question isn’t whether we’ll get there. It’s when.”

Alex Parengkuan

Alex Parengkuan
About Alex

Two decades.
One discovery.

Physiotherapist from 2007. Sports physio. Seven years as head therapist at Neptunus Baseball — six national championships, three European Cups. In those years I learned what actually separates functioning from excelling.

In 2016, during a training in Seattle, I had a flashback to 1994. I was 14 and was nearly left for dead. Twenty-two years later I finally understood: the body keeps the score.

In 2019 I was diagnosed with multiple sclerosis. Within weeks, every symptom was gone. No medication. To this day. What I do for my clients is exactly what I did for myself.

400+
Individual programmes since 2017
5,000+
Treatments as physio (from 2007)
6x
National champion Neptunus
3x
European Cup winner
Core Four Purpose

Purpose gives direction.
REWIRED gives capacity.

Sometimes the question is not how your system performs.
It is who you are when it does.

Core Four Purpose helps you get clear on your passions, talents, values and roles. Not as an exercise but as a foundation. For leaders who want to know exactly who they are before they scale what they do.

Explore Core Four Purpose →
Investment

What 90 days
actually costs.

One day of not performing at your best costs your business more than this programme does.

Founding members — first 5 participants
€5,500
Excluding VAT · One-time payment · Full 90-day programme · After this: €6,600
  • Biological baseline assessment (90 minutes)
  • Personalised plan
  • 12 weekly 1-on-1 sessions via Zoom
  • Blood and gut tests (sent by post)
  • Direct WhatsApp access (90 days)
  • Monthly progress tracking
  • Results guarantee
Book your free Core Four Analysis →

Commit fully. Do what we agree. If after 90 days you haven’t seen real improvement in energy, sleep or pain — you get an extra month, free. No questions asked.

€61 a day to feel like yourself again.
Questions

What you’re probably
wondering.

How do sessions work?
All remote via Zoom. Blood and gut tests arrive by post in the first week. No commute. We cover everything in the free Core Four Analysis.
How much time does this actually take?
The weekly session runs 45–60 minutes. The changes you make aren’t extra — they replace how you already do things. Most participants report getting more time back through higher energy and sharper thinking.
I’m already working with a doctor or specialist. Can I still do this?
Yes. This works alongside existing treatment. We don’t give medical advice and always coordinate with your physician — especially around medication.
How does the guarantee actually work?
Commit fully. Do what we agree. No real improvement after 90 days — extra month, free. No debate. No fine print. This doesn’t work if you go through the motions. But for people who commit — it always works.
Why only 5 spots at a time?
This is fully 1-on-1. I work personally with every participant — no team, no assistants. Five is the maximum I can take on without compromising the quality that gets results.
Start here

You’ve been running
on empty long enough.
Let’s change that.

Book your free Core Four Analysis. 30 minutes. No pitch. We look at what’s actually going on — and whether this is the right next step for you.