Telehealth: Diaphragmatic vs. Pelvic Exercise in Postpartum Pregnancy-related Pelvic Girdle Pain

Inclusion Criteria: * Age between 20-65 years * Postpartum ≥ 3 months * Pain located in sacroiliac joints (i.e., pain located between the posterior iliac crest and gluteal fold) * Pregnancy-related cause of pelvic pain that pain occurs during pregnancy or after delivery (i.e., not traumatic or degenerative cause) * At least 2 positive findings of 6 pain provocation tests for pelvic pain * Score of Active Straight Leg Rise (ASLR) test \> 0 Exclusion Criteria: * being pregnant or actively trying to get pregnant * having known causes of pelvic girdle pain, such as fractures and rheumatism * having undergone lumbar, pelvic, gynecologic or obstetric surgery * having current neurological symptoms and signs in lower extremities such as lumbar radiculopathy and myelopathy * having cancer * having cardiovascular disease * being diagnosed as having a psychiatric disease * active infection or infectious disease in the pelvis or abdomen * having experience with structured and supervised core or trunk exercise training programs.