यथा लगति हृत्कण्ठे कपालावधि सस्वनम् ।
वेगेन पूरयेच्चापि हृत्पद्मावधि मारुतम् ।।
पुनर्विरचयेत्तद्वत पूरयेच्च पुनः पुनः ।
यथैव लोहकारेण भस्त्रा वेगेनचाल्यते
तथैव स्वशरीरस्थं चालयेत् पवनं घिया।।
Bhastrika means bellows of blacksmith. Like bellows Poorak & Rechak are done rapidly. Act of exhalation is more forceful and quick, compare to inhalation which is rather slow and less forceful.
Poorak and Rechak are performed again and again quickly and with force hence the name is Bhastrika Pranayama.
One experiences disease free condition and joyous as well as peaceful mental feeling after regular practice.
Those who have heart trouble or high blood pressure should not do this Pranayama.
In case there is sense of suffocation at any stage of this Pranayama, stop the practice and consult the Yoga expert/teacher.
This will remove unnecessary air from your lungs and easiest way to throw out bacterias from your body.