If you explain Pranayama to people, make sure to set their expectations correctly. If a person does not do any spiritual work, lacks basic ethics, does not try to awake their consciousness, does not strengthen their imagination, etc., then they will perform it in a mechanical way. It might benefit their meditation, but only to a certain level. So they should not expect enlightenment or super Samadhis from it.
But it can be a good starting point, because we all start with our consciousness asleep and being mechanical. It is possible that those people see actual results from a Pranayama practice and then you can explain to them the other spiritual aspects, if they want to go deeper.