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Our services

Our services are there to help you realize your potential, tailored to your level and personal goals.

Trainer Bert Flier

Personal coaching

Personal Coaching means one-to-one guidance by Bert Flier so you have access to all knowledge of 3in1Sports.

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Clinic Duurtraining: Lactaat, Hartslag En Intensiteit

Clinic 'training with lactate'

Curious about what your lactate values are during training and what you can do with them? Then come to the ‘Training with Lactate’ clinic.

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Inspanningstest Fietsen

Excersice test

During an exercise test we determine your metabolic profile and assess your trainability and training zones.

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Notitieblok, Pen En Laptop

Coaching call

If you have a training-related question that you would like to discuss one-on-one with an expert, book a coaching session.

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Bootcamp Munt

3in1sports bootcamp Utrecht

Join the 3in1Sports Bootcamp in Utrecht and work on your physical and mental fitness!

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Run In The Morning

Training schedule

After the intake and exertion test, we will write your training schedule for a minimum of 12 and a maximum of 20 weeks.

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About us

The goal of 3in1Sports is to make athletes shine, push their boundaries, and experience adventures.

Why 3in1sports?

We are personally involved, committed, build on our experience and love to share our passion. We see sport as a supplement, not as the fulfillment of your life.

Our mission

One-to-one coaching, personal involvement, mutual respect and trust are the values of 3in1Sports. Based on a personal relationship we challenge you and motivate you to make your dreams come true.

Our vision

3in1Sports helps you personally, as a team and as a company to make your dreams in sports come true.

Read about sports and health trends first-hand from a multiple Dutch triathlon champion, in the regularly updated…



Of our customers

Based on the theme ‘sports and faith’ we wanted to excite our teenagers. With a professional speaker, who could speak from his experience. We invited Bert Flier. He talked about how he started triathlon and what God and sports mean to him. Based on statements, we discussed being a christian and engaging in professional sports, the tension between living for God and for sports, and about using your talents. It was an inspiring, educational and fun evening where we could ask serious questions and were challenged to make choices.

Jeugdclub de Bouwsteen

Yesterday really had to kick the habit… The formula for the 3in1Sports training camps is special, where people of all kinds and levels come into their own.

Berteke de Jong
Training camp Ardennes

What a cool weekend it was, tough but oh so cool. We’ll be back next year!

Marc and Carla Donkers
Training camp Ardennes

What an excellent training camp! Team spirit, scenic bike rides, beautiful accommodation, great views, healthy meals, everything is possible and nothing is mandatory. Very inspiring!

Gert van Gerner
Training camp Mallorca

Thanks for the inspiring clinic! During the core stability training Bert knew how to make us feel muscles that we had long forgotten.

Triathlonvereniging Heerenveen

Bert gives you the feeling that everything is possible and nothing is mandatory. The different levels and goals were taken into account as well as personal injuries, aches and other imperfections.

Remco Palm
Training camp Mallorca

A big thanks for the coaching to half Ironman Stein! Sometimes it was difficult to make the necessary time commitment, but this was truly one of the best things I have achieved in sports.

Bob de Ruiter
Personal coaching

Sports became a real voyage of discovery for me. The result: I lost 10 kilos, went via the half marathon to the full marathon, then to the half Ironman… and this year on to the Ironman!

Willeke van der Zand
Personal coaching

When I committed to your coaching last year I never thought I could make so much progress. It was an eye-opener in terms of structure, types of sessions and joy in training, but also in terms of lifestyle, nutrition and attitude to life.

Alain van den Berg
Personal coaching
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