Bhastrika Pranayama

‘Bhastrika’ means ‘bellows.’ It is performed by instant and quick expirations of breath.
There are many varieties of bhastrika. The simplest technique is as follows :
Sit in padmasana.
Do 20 strokes of kapalbhati.
Inhale and exhale rapidly, making a puffing sound.
This is a good exercise for abdominal viscera and lungs.