Inclusion Criteria:  Post-partum Primiparous (this is their first child)  Exclusion Criteria:  multiple gestation prescription anti-inflammatory/pain medications that are taken daily significant orthopedic conditions that would contraindicate performance of the fatigue task (such as fractures, severe scoliosis, etc) cardiovascular & pulmonary disease neuromuscular health conditions (such as diabetes, neuropathy, multiple sclerosis, stroke, seizures, etc) history of previous abdominal surgery (with the exception of Cesarean delivery)  Nulligravid Women (Controls)  Women from the surrounding community will also be recruited to serve as controls Nulligravid women will meet the same inclusion/exclusion criteria as the postpartum women, with the exception of never having been pregnant