Psoas and Hip Flexors relax immediately with the correct sensory input.
The technique shown is a Postural Restoration Institute technique. Rhythm and dancing is not owned by anyone.
I offer one-on-one training as well as online consultations via Zoom. The information can be found here:
https://pritrainer.com/on-line-consultations/
For an example of typical exercises for a beginner program, you can look here:
https://pritrainer.com/pri-left-aic-right-bc-beginner-example-program/
Please note, this is quite generic and not sufficient for everybody!