Sign up by filling in the form
Fill out this form and click on 'Signup'. You'll end up in your new profile page where you can fill in the rest of your information.
Create a password for signing in to this site.
Fill out this form and go to the Front Office of the Sports Centre in Leiden or The Hague or Plex-fit to activate your membership. Don't forget to agree with the terms at the bottom of the page. If you want to buy your membership online, go to the 'What's on offer' page after signing in and buy a membership via iDeal.