Make a “U” shape with the thumb and index finger of the right hand.  Close off the right nostril with the thrumbtip and create the following patten:

Inhale through the left nostril — hold the breath in

Exhale through the right nostril (as you release the thumb and block the left nostril with the right index finger.

Inhale through the right nostril — hold the breath in

Exhale through the left nostril.