IRCT2014012816392N1 IRCT 2014-06-15 Mashhad University of Medical Sciences The effect of Exercise program with the birth ball during pregnancy on duration of labor stages The effect of Exercise program with the birth ball on duration of labor stages in nulliparous women 2013-09-16 anticipated 60 Complete https://irct.ir/trial/15350 interventional Randomization: Randomized, Blinding: Not blinded, Placebo: Not used, Assignment: Parallel, Purpose: Other. N/A Pregnancy. Intervention 1: After practical training and face to face and videotape(20 minutes) to intervention group and attendant person, was given to pregnant women a birth ball with booklet, 20-minute training video on CD with check list to ensure implementation of exercise program at home and was asked from mothers is performed this movement until onset of labor(from 34 weeks to term) with the help of attendant trained, three times a week at Home and once a week in the Hospital setting for 20 minutes.the subjects taught about symptoms of the onset of labor,and was requested them go to Hospital at onset of labor with informed to researcher . Intervention 2: In control group,pregnant women were controlled weekly(from 34 weeks to term) until onset of labor.the subjects taught about symptoms of the onset of labor, and was requested them go to Hospital at onset of labor with informed to researcher .