Which exercise should be avoided during the supine position after 16 weeks of gestation?

During pregnancy, particularly after 16 weeks of gestation, it is important to avoid exercises that position the body supine, or lying on the back. This is primarily due to the risk of compressing the inferior vena cava, a major blood vessel that returns blood from the lower body to the heart. As the uterus expands, it can exert pressure on this vein when the individual is lying flat, potentially leading to reduced blood flow to the heart and causing dizziness or even fainting for the pregnant individual.

The recommended approach for workouts as pregnancy progresses is to adapt and modify exercises to ensure both safety and comfort. Given this, exercises performed while lying on the back should be avoided in the later stages of pregnancy, particularly after the first trimester, to minimize any potential adverse effects on blood circulation.

In contrast, exercises like planks, seated twists, or push-ups can typically be modified or performed safely in other positions that do not compromise circulation, making them more appropriate choices for maintaining fitness during pregnancy.