Greetings..

Best explanation i've had.. a teacher was asked what Qi, is.. he thought for a moment, then walked to the corner where a 'blessing bird' vendor was selling the birds (they take prayers to heaven).. anyway, some birds aren't so 'blessed', and they expire.. so, here comes the teacher and he releases a bird that flies away and says, 'Qi'.. he opens the other hand and the bird is dead, he says, "no Qi".. i think it's that simple. What we do with it is another matter entirely..

Be well..