Which of the following is a relative contraindication to exercise during pregnancy?

Mild preeclampsia is considered a relative contraindication to exercise during pregnancy. This means that while exercise may still be possible in some cases, it should be approached with caution and under medical supervision. In situations of mild preeclampsia, the risks might outweigh the benefits; however, it does not completely prohibit exercise, unlike more severe conditions.

In contrast, active preterm labor, uncontrolled type 1 diabetes, and severe preeclampsia are classified as absolute contraindications. In these scenarios, the risks associated with exercise—such as exacerbating the mother's conditions or endangering the fetus—greatly outweigh any potential benefits. Thus, individuals facing these issues are typically advised to avoid exercise completely to ensure both their safety and that of the developing baby.