Thirty-seven Cases with chronic low back pain were treated by developing the abdominal muscles exercise. They were classfied into two groups. Eighteen cases (A) who could sit up from 25 to 30 times with the hands clasped behind the head and knees flexed, showed improvement of the low back pain (71.2%), the leg pain (52.9%) and the constipation (75%). The other group (B) that could sit up less than 25 times, also showed improvement but it was less than that of the former group.
