Trunk exercises included weight-shifting and arm flexion in the sitting position. During the weight shifting exercise, the
subjects were instructed to sit with their arms folded and to shift their weights from midline to the right and left, as far as they
could, and touch a bar placed on both sides. During the arm flexion exercise, the subjects were instructed to flex both their
arms as high as they could. The experimental group performed the exercises on the balance pad, and the control group, on a
stable surface, for 30 min, 5 times a week for 4 weeks.