When you stand, touch the front side of your body, your ribs and abdomen are not protruding, your coccyx is straight down, your hips should not lean back too much, and your pelvis should return to the center of your body. At this time, the lumbar spine has no pressure, showing natural bending and no excessive bending.
Another example is doing it? Low snake? At that time, many people directly lifted the sternum off the ground. At this time, the lumbar spine is very compressed. In fact, the action of the upper body is not to lift, but to lengthen the spine forward. Use the position of Baihui point in the head to lengthen the neck, and the neck pulls the thoracic and lumbar vertebrae forward. After the whole stretch, the spine naturally bends, your thoracic spine naturally bends, and your upper chest leaves the ground. The whole process is the process of lengthening the spine for physical therapy, not the process of directly lifting the upper body.