Nadi Shodhana

Sometimes this is called Anuloma Viloma or Alternate Nasal Breathing.
This simple but soothing pranayama works on balancing the Ida and Pingala channels to bring the prana to the Sushumna and balances the 2 hemispheres of the brain.
Also, Gerald talks about how to keep track of the number of rounds you do with a simple technique using the hand.

C’est une technique simple et apaisante qui travaille sur l’équilibrage des trois principaux Nadis avec la respiration et des 2 hémisphères du cerveau.