The word kumbhak means “retention” in Sanskrit, and in yoga practice it is related to the retention of air after inhalation or exhalation, once you have learned to control your breathing. Kumbhak yoga is a practice where different asanas (postures), pranayamas (breaths), mudras (“seals”), bandhas (energy closures), meditation, mantras (sacred syllables) and a philosophical talk of jnana yoga (yoga of the knowledge).