Yogic dhyana originates in back brain, based on past experience.
Yogic dhyana commences with pranayama. Pranayama to samadhi is a single continuous process.
Prana kriya touches 350 nadis (channels) within.
Breath driven to touch pranic manas (mind), loosen grip of mental vasanas (tendencies).
Asanas teach pranayama fundamentals—breath uses, applications, processes.