Well, most importantly, because Oxygen is the most significant nutrient humans require. Breath is the first act of life and without it life ends.
Slow Deep Breathes, taken in the nose, offer many benefits such as...
resetting homeostasis after a stress response
aids in removing toxins from the body
can improve circulation
supports releasing muscle tension
can help movement of lymph in your chest cavity
likely to boost your mood
elevates the energy flow through your body
promotes healing and rejuvenation
strengthens your respiratory system
Be tall and proud through your spine, Slowly draw breath in through your nose to fill your lungs from their bottom first then upwards to the top. Then peacefully exhale. Repeat as many times as you like and as often as needed / wanted. I like to take "breath breaks" during the day to bring about peacefulness.
If you wish to magnify the value of your deep breathing throughout your whole being, consider "stacking"...
Envisioning Beautiful things
Conjuring an attitude of Gratitude
Being in the essence of Compassion
Believing in your Self Worth and Importance to the world
...during your slow deep breathes.
If you wish to learn a specialized breathing technique with some other beneficial qualities check out my video on the 4 x 4 Breath. Click HERE to view it.
I hope you will enjoy some "breath breaks" regularly throughout your day.
Love & Light