Professional dancers, in addition to their excellent conditions, more importantly, professional physical training methods, which is called "plastic surgery" in the dance industry. The specific methods of professional physical training are: standing, heels together, feet and toes spreading outward 180 degrees, forming a word "one", which is technically called "one". Everyone can experience it for themselves, so that when standing, people's posture will be particularly tall and straight. While creating a tall and straight posture, dancers also form a "splayed foot", which is a professional feature of dancers. The scientific principle of professional body training: The dance teaching material thinks that the core of "one person" is to force the human body's center of gravity to move backward by spreading its feet outward. The center of gravity of hunchback is in the front foot, and the center of gravity of tall and straight figure is in the heel. Humpback can be corrected by shifting the center of gravity back to the heel, and it can be corrected fundamentally. After long-term training, the back will be well exercised, forming a powerful muscle splint and keeping the spine straight. This is the "shaping" of dance, and the perfect posture of dancers is so "whole".