The Bene Gesserit system of nerve and muscle training that grants practitioners supreme control over their bodies. Beginning in early childhood, prana (nerve) and bindu (muscle) exercises teach adepts to control heartbeat, body temperature, individual muscles, and cellular chemistry. This training forms the foundation of all Bene Gesserit abilities, from their fearsome martial arts (the 'weirding ways') to poison detection and neutralisation, wound healing, and the deep concentration modes used for observation and analysis. The Azhar Book states that only through profound prana-bindu control can one be protected against possession.