A nurse is caring for a client who is in her first trimester of pregnancy and asks the nurse if she can continue to exercise during pregnancy. Which of the following responses by the nurse is appropriate?

A. "Activities that raise the body temperature, such as saunas and hot tubs, are safe until the third trimester.": Activities that significantly raise maternal core temperature, such as hot tubs and saunas, should be avoided throughout pregnancy because hyperthermia during early gestation increases the risk of neural tube defects and fetal distress. B. "It is recommended that pregnant clients limit their exercise routine to stretching activities on a mat several times a week.": Restricting activity to stretching underestimates the benefits of aerobic and strength-conditioning exercises. Moderate-intensity activities like walking, or prenatal yoga support cardiovascular health, weight management, and improved labor outcomes. C. "Daily exercise for up to 30 minutes is fine throughout the pregnancy.": Engaging in moderate exercise for about 30 minutes most days is safe and encouraged for most healthy pregnant individuals. It promotes circulation, reduces back pain, improves mood, and supports healthy weight gain, provided no medical or obstetric contraindications exist. D. "Exercising during pregnancy is not recommended.": Exercise avoidance is outdated and potentially harmful, as inactivity increases risks of gestational diabetes, excessive weight gain, and poor cardiovascular conditioning. Regular, safe physical activity is beneficial for both mother and fetus.