Tawakkul is the belief that God is over all things competent, that He is the one upon whom we should rely. Who can we trust more than God The Ever-living, The Creator, Sustainer, The All-capable? But how can we know if we truly trust God? Take the test.
But Allah Almighty is that Al-Hayy is not subject to time as we are; in fact He is the creator of time. So we’re trying to understand Him within the construct of His own creation.
Tawakkul is not an act of the limbs; it is an act of the heart. And so while the limbs are striving hard, the heart is completely reliant on Allah.