The Buddha said that the past is gone and the future is not yet here. Let us not regret the past. Let us not worry about the future. Go back to the present moment and live deeply the present moment. Because the present moment is the only moment where you can touch life.
Life is available only in the present moment.
That is why walking meditation is to go back to the present moment, in order to be alive again and to touch life deeply in that moment. In order to be able to touch the earth with our feet and enjoy walking, we have to establish ourselves firmly in the present moment, in the here and the now. In walking meditation, we walk like a free person. This is not political freedom. This is freedom from afflictions, from sorrow, from fear.