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Frequently Asked Questions:


  • If you want to know more about the ST Home Study Course Click HERE >>
  • If you would like to join a clinic with Marijke de Jong, click HERE >>
  • If you would like to organize a clinic with Marijke, click HERE to read about the conditions (step 7) >>
  • If you want to know how to become an ST Instructor, click HERE >>
  • If you forgot your password for one of our programs, please click “I forgot my password” on the login page and use the email you used when enrolling in the specific program. A new password will then be emailed to you.
  • If you would like to register for ST Mastery, please send an email to [email protected].


Other questions, comments or suggestions:


If you have any other question, a comment or suggestion, we would like to hear about it!

Please send an email to [email protected].

We will do our best to answer all questions within 24 hours.

— Straightness Training Team


Straightness Training Corporation

Marijke de Jong

Rijksstraatweg 269-U

3956 CP Leersum

The Netherlands

Chamber of Commerce (Kamer van Koophandel): 09193042

BTW: NL169185448B01