Team

Long term commitment

Our personal trainers come from diverse backgrounds in sport, dance, nutrition, health science and physiotherapy. Each of us brings a unique approach, yet we all follow the same core Sim principles: move with intention, respect your body and build strength that lasts.

At Sim, we work together to guide you on your journey to better health. Consistency and long-term commitment are key — and we’ll help you find the trainer who’s the best match for you.

Below, you can explore each trainer in more detail and choose who you’d like to work with.

Personal trainer guiding client during a session

Trainer supporting client with strength training

Meet Our Team

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Lisette Koster

“Work with your body, not against it.”

My aim is to train people to be strong and fit enough to do whatever they want to do in life, paying particular attention to getting the body back into balance. I work on improving and strengthening movement patterns, which in turn lowers the risk of injury, and can also help with rehabilitation if needed.

I have a background in Sport Psychology & Stress Management and Break(dance) and a broad experience in working with various types of people. I specialise in sport specific training for breakers and have experience in working with clients with hormonal imbalances due to burn-outs and menopause & with cancer patients taking hormonal treatment.

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Floor Blijenberg

“Caring for the body is an act of reverence for life itself.”

You're on the verge of starting personal training, and you feel the time is right, but you're looking for someone who truly understands your limits. Maybe you're recovering from an injury, just getting back on your feet, navigating the unique needs of pre- or postnatal training, or you have specific competition goals and want to prepare safely. Whatever your journey looks like, you're looking for guidance that gives you confidence and helps you grow stronger, step by step.

Hi, I’m Floor Blijenberg, and I’m a physical therapist. I’m here to help you with your training — and if you need any treatment along the way, I’ve got you covered. I work with people at all levels, from those just starting out to seasoned athletes. I’d love to support you on your journey.

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Darshan Brassinga

“Prevention is powerful — health starts with small, consistent choices.”

Hi, I’m Darshan Brassinga — a health scientist passionate about helping people live healthier, more vibrant lives. I hold a Bachelor’s degree in Nutrition & Dietetics and a Master’s degree in Health Sciences with a focus on Prevention and Public Health.

I believe that health is wealth, and that prevention and education are some of the most powerful tools we have to build stronger, healthier communities.

As a Health Scientist, Personal Trainer, and Dietitian, I guide people toward their goals through evidence-based nutrition, strength training, and realistic lifestyle coaching. Whether you're managing weight, building strength, or simply wanting to feel better every day, we’ll create sustainable strategies that fit your life and routine.

Health isn’t about perfection or quick fixes — it’s about long-term progress, consistency, and small changes that add up to lasting results. My mission is to empower you to take control of your well-being — physically and mentally.

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Vivian H. Schrijver

“Fitness is a celebration of what your body can do.”

My journey began long before coaching — in a body I once struggled to accept. I understand how intimidating fitness can feel when all you want is to feel safe, confident, and supported rather than judged.

I coach with empathy and evidence-based methods, especially for women in their 30s, postpartum mothers, and anyone who’s ever felt unseen in traditional gym spaces.

As a certified personal trainer specializing in fitness nutrition and prenatal & postpartum coaching, my focus is on sustainable strength, balanced movement, and rebuilding trust in your body — no extremes, no shame, just real progress at your pace.

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Trey Hart

“Building strength through play.”

I help athletes, teens, busy parents and anyone who wants to feel strong, capable and confident — without dreading the process or feeling judged. Training should be smart, fun and built for real life.

No generic workouts — just science-backed programming focused on movement quality, technique, mobility and sustainable progress, so you stay strong, injury-free and proud of what your body can do.

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Georgios Tatsis

“Listen to your body.”

Hey, my name is Georgios and I’m here to help you build a routine where exercise becomes non-negotiable. With a swimming background and a master's degree in injury prevention, my priority is helping you move well without pressure or overwhelm.

Whether it’s your first session or your hundredth, we will build a plan around your needs, goals and pace — strengthening weaknesses, building confidence and creating sustainable momentum that fits real life.

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Gianluca Banfi

“Consistency and dedication build real results.”

I’m a sport scientist and strength & conditioning coach with a background in team sports, track performance and endurance training. My philosophy: structure + commitment = transformation.

I believe growth is earned through consistency, not perfection. Together, we build strength, resilience and standards that carry into life — not just the gym.

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Team

Long term commitment