This is a classic yoga action "tree". This action requires high hip joint, muscle strength, muscle endurance and sense of balance. It is difficult for new students to concentrate at the beginning of the training room. The most difficult thing about this action is to look up at the ceiling, look straight at the floor, it is more difficult to step on the mat, and it is easier on the floor. It is a very balanced posture in sports. Balance posture is to balance the heart first, then the body, and finally the posture.