Sit on Padmasana or Siddhasana. Inhale rapidly through both nostrils making sound of Bhramara, the bee, and exhale rapidly through both nostrils, making the humming sound.
You can carry the process till the body is bathed in perspiration. In the end inhale through both nostrils, retain the breath as long as you can do it comfortably and then exhale slowly through both nostrils. The joy which the practitioner gets in making the Kumbhaka is unlimited and indescribable. In the beginning, heat of the body is increased as the circulation of blood is quickened. In the end the body-heat is decreased by perspiration. By success in this Bhramari Kumbhaka the Yogic student gets success in Samadhi.