2, chest, spine straight, don't shrug.
3. Take a step sideways with either foot, straighten the other foot that supports the center of gravity, and move all the weight to this foot, so that the pelvis can move sideways, so that the weight is placed on the heel of the supporting foot, and the knee should be locked backwards. As for the range of pelvic movement, it should be based on the principle of not affecting the upper body posture.