In a class for women in their second trimester, which statement indicates a need for further instruction about alleviating back pain?

The statement indicating a need for further instruction about alleviating back pain is one that suggests a body position or behavior that may exacerbate discomfort rather than relieve it. Leaning slightly backward while walking can lead to an improper alignment of the spine and pelvis, which may contribute to increased strain on the back muscles and worsening pain.

In contrast, the other statements reflect practices that promote good posture and body mechanics. Practicing good posture when sitting helps maintain proper spinal alignment, reducing strain. Using a firm mattress is beneficial as it provides better support for the back during sleep, and avoiding high heels helps maintain a more stable, supportive foot position, preventing additional stress on the lower back. Therefore, the focus should be on engaging in activities that support proper alignment and relieve pressure on the spine throughout the day.