Pranayama is a method of harnessing energy.
"Prana means breath and Ayama means control. By Pranayama is meant the control of Prana and the vital forces of the body. Pranayama begins with the regulation of breath and ends in establishing full and perfect control over the life-currents or inner vital forces. In other words, Pranayama is the perfect control of the life-currents through regulation of breath. Breath like electricity is gross Prana. By establishing control over the gross Prana, you can easily gain control over the subtle Prana inside. The process by which such control is established is called Pranayama." - Swami Sivananda
"We should not mistake the Truth with opinions. Many think that the Truth is this or that, or that the Truth is within this or that book, or within this or that belief or idea, etc. Whosoever wants to experience the Truth should not mistake beliefs, ideas, opinions and theories with that which is the Truth. We must experience the Truth in a direct, practical and real manner; this is only possible in the stillness and silence of the mind, and this is achieved by means of meditation."