A nurse is caring for a client during a nonstress test (NST). At the end of a 20-minute period of observation, the nurse noted the following findings: The fetal heart rate baseline is 120 beats per minute with no decelerations. There are two accelerations increasing the fetal heart rate by 15 beats above the baseline during a period of fetal movement, each lasting 20 seconds. What reason would the nurse provide to explain to the pregnant client a reactive test?