More On Deep Breathing (Diaphragmatic Breathing)

 It is used widely for relieving stress and to help treat health issues like depression, PTSD, insomnia, etc.

"... It is estimated that 90% of us are breathing incorrectly and the consequences - from sleep apnoea to snoring, from asthma to allergies and hypertension - can cause lasting health issues in your life..."
Gavin Newsham, 2021

It is important to breathe slowly and rhythmically through your nose.

It is simple and effective.

Apparently, we have evolved with smaller mouths and airways, which encourages shallow breathing. This is further exaggerated by pollution, stress, obesity, sedentary lifestyles, etc.

To handle this you need to control your breathing by

i) '365'
"... You breathe 6 times a minute, inhaling for 5 seconds and exhaling for 5 seconds, at least 3 times a day, for 5 minutes at a time and then repeat for all 365 days of the year..."
Gavin Newsham, 2021

ii) parasympathetic rest
"...1. Place your hand on the bottom of the rib cage......
     2. Inhale through your nose for 5 seconds, keeping your neck and shoulders relaxed and relatively still feeling and expansion through your mid/low ribs and abdomen.
     3. Exhale through your nose for 5 seconds
     4. Repeat this cycle for at least 3 minutes - but there really is no limit to how long you can go..."
Gavin Newsham, 2021

NB in addition to breathing correctly, you still need to exercise regularly, get enough sleep, eat correctly, etc