There are some very common phrases such as "más rápido" which seem to be impossible for me to say.
I cannot move my tongue fast enough from the 's' position to the start of the 'rr' position so I always have to pause between the consonants, or I end up putting a vowel between them and saying "más a rápido".
I aiming to speak with a standard Castillian accent, so I don't want to aspirate the preceding s to a [h].
I have seen [one source](https://youtu.be/iGKgQMtP9MU?t=351) say that it is pronounced as what I think is with the tongue in the same place as for a rr but as a fricative instead of a trill ( [ʐ] ).
Would you say this is accurate? Are there other ways people say it?
Thanks a lot!
Edit: I just realised (from trying to say "muy rápido") that I also find it impossible to say the 'rr' sound following the 'i' or 'y' sound (another example: "Rey y Reina") so any help on that would be appreciated too