There is no breath that calms everyone. The one that settles your friend may leave you worse, and that is information about your body rather than a failure in you.
Labels like calming or energising are a rough guide at best. What actually happens depends on how you usually breathe, what your body has been through, and where you are starting from that day. So try one, and give it enough attention to notice what it did, not what it was meant to do.
Qur’an and Sunnah
We are closer to him than his jugular vein (Quran 50:16). Whatever your own body does with a given breath, it is not strange or hidden to the One who made it.
وَلَقَدۡ خَلَقۡنَا ٱلۡإِنسَٰنَ وَنَعۡلَمُ مَا تُوَسۡوِسُ بِهِۦ نَفۡسُهُۥۖ وَنَحۡنُ أَقۡرَبُ إِلَيۡهِ مِنۡ حَبۡلِ ٱلۡوَرِيدِ
We created man––We know what his soul whispers to him: We are closer to him than his jugular vein––
Qur’an 50:16read it in the library
Translation: M.A.S. Abdel Haleem, The Qur'an, Oxford University Press, 2004.
What the research says
In a crossover trial with 42 students, three paced breathing rates were compared and the slowest of the personalised paces brought the greatest sense of relaxation and the largest drop in physiological arousal. Even there the pace was set for each person rather than fixed for everyone, and the group was small and healthy. It is a fair steer towards slower, not a licence to say one count suits all.
Moebus L, Spitschan M, Ehrlenspiel F. (2026). Lower breathing frequencies in personalized slow-paced breathing enhance relaxation and reduce arousal.. iScience doi
Strength of evidence: one line of research. A single study, or a theoretical account.
Why it works
Your nervous system responds to a change in breathing from wherever it already is, and that starting point is different in every body.
This one is still a draft. It is waiting on a scholar and a clinician to read it before it is published.
Near this one
Hot yoga asks you to keep drinking all the way through the class. If forgetting to eat and drink is one of your regular problems, choose a different room.
These practices are not only pleasant. They change things you could measure, which is worth knowing on the days when pleasant is not reason enough to bother.
End a practice with a question rather than a conclusion. What do you notice works better than telling someone what should have happened.