Autogenic Breathing, also known as Combat Breathing or Inhale-Stop-Exhale, is a breathing technique to calm you down and relax without having a focus on it. Martial Arts, law enforcement or military personnel use it often for keeping cool and getting a clear mind before the action happens.
It is similar to abhyantara kumbhaka, a step in pranayama, the Indian breathing practice which is a part of yoga. You inhale, hold your breath for a certain time and then exhale. Depending on the technique and context it has different goals; be it body harmony, meditation or in the case of Autogenic Breathing to prepare you for stressful events.
As the Systema Breathing from the last article it helps you to stay calm during stress; be it a raid, public speaking, a presentation or a meeting. But unlike Systema Breathing it is all about breathing and no coordination with movements.
Reminder: Inhale through your nose and into your abdomen. Exhale through your mouth.
Focus on your breath - in and out -in and out - and count your breath. If a count of 3 is too much at the beginning, just go with a rhythm which feels naturally for you. But try to come back to an evenly paced rhythm.