Which condition is NOT typically a cause of postpartum hemorrhage?

Postpartum hemorrhage (PPH) is primarily related to several well-documented conditions involving the uterus and factors affecting blood coagulation. Uterine atony, which is the lack of muscle tone in the uterus leading to inadequate contraction after delivery, is considered one of the most common causes of PPH. Similarly, retained placenta can prevent the uterus from contracting effectively, also contributing significantly to hemorrhage. Coagulation disorders can complicate the situation by impairing the body's ability to form clots, further exacerbating bleeding.

On the other hand, excessive exercise during pregnancy does not typically lead to PPH. While exercise is vital for overall health and can be beneficial, it is generally not associated with the direct physiological issues that cause PPH. Instead, PPH is linked to factors like uterine tone and placental retention, which exercise does not impact in a way that would lead to significant bleeding after childbirth. Thus, identifying excessive exercise as unrelated to PPH highlights the distinction between lifestyle choices during pregnancy and the medical conditions that can lead to complications after delivery.