The root word for "spiritual" has changed through the various ages, from translation from Hebrew (ruwach) to Greek (pneuma) to Latin (spiritus):
Even though the root concept of spirituality is rooted in the wind — God's breath, the physical manifestations of God's interactions with the elements of earth — the word has come to mean exactly the opposite of physical.
But,
Ancient spirituality was physical. God was not yet this immortal, invisible, inconceivable mystery: God could walk in a garden. God could be a pillar of fire, real fire. God could talk in a cloud. God had two hands. God had breath.
And He has breath. Breath that gives life, words that restore it, and love that redeems it.