The mat which does not press the backbone and makes effective web reinforcement motion possible

摘要

Topic The non efficiency which is due to the burden to the backbone at the time of web reinforcement motion and the load to the root muscle of the first arrival web reinforcement motion is lost.SolutionsThe channel is provided in the center section of the mat, the material where forma is difficult to deteriorate is used and semicircle arc-shaped angle one side 40 (20) already one side is designated as the 30 (20). Choice figure Drawing 1