That to know by the somatotype transformed, one grade raised to 3rd grade, ectomorph type trend to Mesomorph type or Endomorph type, Until 4th grade trend to Ectomorph type or Mesomorph type. 4.

㈢由罗列指数，了解学长体，由一级至三级时，从瘦长趋向适中、肥胖，至四级则及趋向瘦长、适中体。