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The supine position, where an individual lies flat on their back, should be avoided by pregnant women during workouts, particularly after the first trimester. This recommendation stems from physiological changes that occur during pregnancy, specifically the potential for the growing uterus to compress major blood vessels like the inferior vena cava. Such compression can lead to reduced blood flow to the heart and the fetus, resulting in symptoms such as dizziness, decreased blood pressure, or even fainting.

In contrast, the standing position allows for greater stability and engagement of core muscles; the sitting position can provide support and lessen strain; and the side-lying position is often encouraged for comfort and to avoid pressure on the back and abdomen. Therefore, avoiding the supine position helps ensure the safety and well-being of both the mother and the developing baby during physical activity.