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human
Pranayama or Kriya is incredible if you do it right.
As you breathe inwards, start at the base of the spine, visualize prana travelling up through the spine to your pineal gland or around that area, then visualize it travelling to the space in the middle of your brow (third eye), hold it for three seconds while holding your breathe, then exhale and visualize it travelling back to the head, then down to the base of your spine. 
At first you'll only be able to visualize it, but after some practice you'll start to get glimpses of actually feeling the prana travelling up your spine. There are additions you can make to this technique but those are the basics.

One day whilst doing it I actually sensed the prana going up through me and I felt indescribable ecstatic bliss. I don't feel it all the time but its becoming more and more frequent. Just imagine the yogis who have perfected Pranayama and are able to feel it every single repetition.
>'One half-minute of revolution of energy around the sensitive spinal cord of man effects subtle progress in his evolution; that half-minute of Kriya equals one year of natural spiritual unfoldment.'
gpt
If you cant blow out a candle infront you at a minimum using these techniques-then it's useless.