FUNDAMENTALS

Blog

Train smarter.

Training, food, recovery and the people behind Fundamentals. Written by our coaches.

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Training

Open Gym or Personal Training: What Fits Your Experience and Goals?

Open Gym gives you freedom. Personal training adds a plan, technique coaching and accountability. Discover which approach fits your experience, goals and the obstacles that held you back before.

Latest

New on the blog.

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Training

Open Gym or Personal Training: What Fits Your Experience and Goals?

Open Gym gives you freedom. Personal training adds a plan, technique coaching and accountability. Discover which approach fits your experience, goals and the obstacles that held you back before.
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Group training

Small Group Personal Training & Group Classes

At Fundamentals Haarlem-Oost, you can choose between two formats: group classes with Eva and 1-to-8 Small Group Personal Training. Find out which suits you below. We currently do not offer group classes at our other locations.
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Training

Personal Training — Experience

What happens after you request an Experience? Find out how to prepare, how we can make the most of our collaboration and how we can support you.
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Nutrition

Training in Winter

Build in winter, refine in spring: a smart approach towards summer. Anyone who has trained for a while knows that results come from timing, not isolated actions. Winter is traditionally when the foundation is laid: fewer distractions, more training focus and better recovery. That makes it a time to build muscle and develop strength.
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Community

The Haarlem Running Club X Fundamentals Running

A strong alliance for runners who want more Welcome to the official page of the Haarlem Running Club X Fundamentals, a new collaboration designed to help runners of all levels move better, stay injury free and perform with confidence. Whether you are training for a five kilometre event, a half marathon or a full marathon, our partnership offers the perfect combination of community based running and strength focused coaching.
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Community

Expat living in Haarlem

Are you an expat living in Haarlem and looking for a way to feel stronger, healthier, and more confident? Finding the right gym in Haarlem can be challenging — especially when you want more than just a place filled with machines. You want results, guidance, and a welcoming community. That’s exactly what we offer at Fundamentals Haarlem.

Meet the coach

The people behind your training.

Meet the coach

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Meet the coach

Joey Wolthuis

Joey believes in a complete approach to a healthy lifestyle. When you are ready, expect challenging training supported by a sound plan, good nutrition and recovery advice. Learn more about Joey in this blog.
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Meet the coach

Jose Fernando Miguel

José combines structured hypertrophy training with conditioning and HYROX-inspired elements. First, build a strong foundation in strength and technique; then challenge your body with intensity, fitness and functional movement.
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Meet the coach

Maarten Dumez

Our friendly Flemish coach would love to help you become stronger, fitter and more confident. Maarten is an advanced strength athlete with a clear passion for methodical training, intelligent programming and measurable progress.
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Meet the coach

Seddik Badaoui

Seddik is an authority on muscle development, strength training and nutrition. His calm, direct and approachable coaching helps people become stronger, fitter and more confident without unnecessary complexity.
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Meet the coach

Shandi Barker

Born and raised in Canada, Shandi Barker moved to the Netherlands several years ago for love, and since then has built a life combining health, movement, coaching, and community. Along the way, she has also learned to speak a solid amount of Dutch, making her an ideal coach for both Dutch speaking and international clients. Shandi holds a Bachelor’s degree in Kinesiology and works as both a personal trainer and online coach. Alongside her work at Fundamentals, she runs her own online coaching business and helps clients create stronger, healthier, and more sustainable lifestyles through evidence based training and nutrition guidance.
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Meet the coach

Lianne Norbruis

Lianne's background is in Pilates and barre, where control, posture, breathing and body awareness are central. She is also trained in strength training and hypertrophy.
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Meet the coach

Thijs Avezaat

This series introduces the Fundamentals trainers. Here, meet Thijs Avezaat, owner of Fundamentals and a personal trainer who helps you reach your goals. Learn about his background, his role and what to expect when training with him. A current client also shares her experience.

More articles

Training, food and recovery.

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Training

How to Programme Strength Training for Optimal Muscle Growth

Whether you are new to strength training or have been doing it for years, muscle growth and strength gains are not a magic trick: they come from good planning and consistent execution. Countless routines and recommendations circulate in fitness, often without clear scientific support. At Fundamentals, we want to challenge those myths and explain how training principles really work. This blog covers working sets, differences between men and women, training to failure, and adapting your programme to your age and experience.
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Training

Start Personal Training at Fundamentals

Summer is behind us. For many people, this is the moment to look back and think: “Next year, I want to be fitter, have more energy and feel better in my body.” Perhaps you did not quite recognise yourself in the mirror or felt less confident in your swimwear. The good news: now, in autumn, is the best time to begin.
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Training

Hormones, Hormonal Balance and Strength Training

Hormones are the invisible directors of our bodies. They influence how we feel, our energy, our sleep, and how easily we build muscle or lose fat. Put simply, hormones determine everything. Yet many people rarely consider the influence of their hormonal system, let alone how they can positively influence it themselves.
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Community

New Machines!

Five new machines are coming to Fundamentals in Haarlem from September. Our gym has been running for around six years, and more people are finding their way to Fundamentals. That is great: Haarlem is getting fitter, while demand on the gym is increasing. We have therefore decided to invest in the gym so we can offer as many people as possible a pleasant place to train within our available space. More equipment means more people can perform their exercises at the same time.
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Recovery

Henshaw, Hyperbaric Oxygen, COVID-19 and Recovery

Recover faster. Perform better. Breathe pure oxygen.
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Nutrition

Ozempic

What is Ozempic? Who is it really for? What are the benefits — and what are the dangers if you don’t change your habits? Most importantly: what happens when you stop taking it?
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Nutrition

Losing Weight by Losing Fat

Summer is approaching. If you want to lose a few kilos, there is no time to waste. Perhaps beach days or summer clothes are on your mind, or you simply want to feel fitter when the sun returns. Whatever your reason, the right approach can still help you lose four to seven kilos of fat before summer.
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Community

Personal Training for Expats

​At Fundamentals, we understand that as an expatriate, finding a gym that aligns with your unique needs can be challenging. Located in both Haarlem and Alkmaar, Fundamentals offers a personalized approach to fitness, ensuring that every client, regardless of their background, feels at home.
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Training

Open Gym — Kickstart

Ready to feel stronger, fitter and prepared for summer? Join our three-month try-out package!
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Group training

Welcome Aboard! Group Training

What to expect from group training and the way we work.
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Community

Welcome Aboard! Open Gym

Your own key, flexible training and a shared responsibility for safety. Everything you need to know before your first independent Open Gym session.
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Community

Welcome Aboard! Kickstart

What happens after you request a Kickstart? Learn how to prepare, how we can make the most of our collaboration and how we can support you.
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