- Isometric training of the abdominal muscles The aim of the training will be to increase intra-abdominal pressure (which compresses the intestines) and the colonic propulsive force during voluntary effort. Considering that there is indirect synergic activation between the pelvic floor muscle and the lower abdominal muscle, the operation of the voluntary isometric contraction of the upper abdomen and the simultaneous relaxation of the lower abdomen improves muscle coordination, relaxation of the pelvic floor and relaxation of the external anal sphincter, thus optimizing bowel movement. This consist of a contraction of the upper abdomen muscle and diaphragm and the simultaneous relaxation of the lower abdomen, under the supervision of the physiotherapist. Training will be carried out in two manners: with the patient lying in a left lateral decubitus position with the hip and knee flexed at 90º and sitting. In the lying method, training began with two series of eight contractions and relaxations, into the third week, and then will increase to two series of twelve contractions and relaxations, and will remain so until the sixth week. In the sitting method, training will begin with one series of three contractions and relaxations lasting ten seconds, increasing to five repetitions in the third week, and remaining so until the sixth week. The exercise will considered successfully carried out when a protrusion of the lower abdomen was visible, indicating the simultaneous relaxation of the lower abdomen and the pelvic floor, from which point the series was initiated.