Spiritual work aims to break mind out of the boundaries of self – out of thought – and into/onto a plane of extension/extensity/extensivity we call the divine. In Taiji we manage this by training legs/dantien to grab the ground with animal intensity, thereby supplying the heart with a steady stream of spirit which, with our vertical spine, we whip upward rather than outward, breaking free of Earth's gravity and extending joyfully to God, maybe. Simple really, just difficult to do, and its getting more and more difficult the more our culture weakens its individuals by encouraging them to rely on its crutches of money, morality and medicine.