<![CDATA[Low back pain (LBP) is a prevalent condition during the third trimester of pregnancy that significantly impacts maternal quality of life. While physical activity is recommended, context-specific evidence regarding the effectiveness of standardized gym ball training in primary care settings, particularly in Indonesia, remains limited. This study aimed to evaluate the effectiveness of a standardized gym ball training program in reducing low back pain intensity among third-trimester pregnant women attending the Lubuk Alung Public Health Center, West Sumatra. A quasi-experimental one-group pretest–posttest design was employed. The study involved 16 third-trimester pregnant women who were selected through purposive sampling. Participants underwent a four-week intervention comprising eight sessions of supervised gym ball exercises (25–30 minutes per session). Pain intensity was measured using the Numeric Rating Scale (NRS) before and after the intervention. Data were analyzed using the Paired Sample T-test. The baseline mean LBP intensity was 5.06 (SD = 0.68), indicating moderate pain. Post-intervention, the mean score significantly decreased to 1.19 (SD = 0.40), indicating mild pain (p < 0.001). The mean reduction was 3.87 points, representing a clinically significant improvement of approximately 76.5%. Standardized gym ball training is effective in significantly reducing low back pain intensity in third-trimester pregnant women. The intervention is feasible and safe for implementation in primary care settings as a non-pharmacological approach to improve maternal well-being.]]>
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