FUNDAMENTALS
No. The open gym is €55 a month (Alkmaar €50), cancellable monthly, without a sign-up fee.
Your own key
Open gym
Train whenever it suits you. Members get an electronic key on their phone and the freedom to train on their own, in a gym where people take training seriously.
Price
€55
per month · Alkmaar €50
Haarlem
24/7
Centrum and Oost
Sign-up fee
€0
no contract
For
Experienced
lifters who train safely alone
Opening hours
In Haarlem, the door is always open.
Own-key system: the electronic key is on your phone. All based on mutual trust.
24/7
Haarlem Centrum
Essenstraat 25 · headphones only 22:00–07:00
24/7
Haarlem Oost
Rockplein 10 · Slachthuis
06–22
h
Alkmaar
Laat 47 · every day
Who it's for
For people who already train on their own.
When you're alone in the gym, you have to know what you're doing. That's why we only give open gym access to experienced lifters.
New to training? Start with a Kickstart. Three sessions with a coach to learn the basics, and your coach tells you when you're ready for the key.
House rules
Freedom comes with a few rules.
Personal training is our core business. Keep these in mind and everyone enjoys the gym.
01
Know the door
You're responsible for knowing how the door and your key work.
02
Last one out
Lights off, music off, door closed.
03
Clean up
Put your equipment back where you found it.
04
Train safe
No risky lifts alone, like a max attempt without safety pins.
05
Mind the neighbours
Respect the gym and the neighbours, especially late at night.
06
Coaches go first
When it's busy, a coach giving personal training gets priority on equipment.
Getting your key
From sign-up to your first session.
Sign up
Choose your gym. €55 a month, Alkmaar €50.
Activate the app
You get an activation email for our app and your key.
Watch the door videos
Then you receive your personal code by text or WhatsApp.
Train
Whenever it suits you.
Also at Fundamentals
Combine what works for you.
Most members mix coached sessions with training on their own.
Don't be shy.
Just say hi.
© Fundamentals 2017–2026
Your start
30-second check
Which start fits you?
Three questions. No email needed.
How much do you train right now?