Liu Qi illustrates the 24-style Taijiquan biography: Chinese medicine believes that after a person is over 40 years old, the liver and kidney are most likely to collapse, which is like the leaves of a big tree will turn yellow and fall off. Therefore, watering and fertilizing should start from the roots, nourishing the liver and tonifying the kidney, which is the secret of health preservation. Between the abdomen and the vital gate (i.e. the lower abdomen), it is the most critical and fundamental part for the human body to absorb and circulate qi and blood, making it the essence and blood. Strengthening the movement of the abdomen and lower limbs is very beneficial to the body, and Tai Ji Chuan is just such a way to practice footwall movement.