Final answer:
An adult with a busy work schedule is most likely to increase his or her physical activity by making small lifestyle changes.
Step-by-step explanation:
According to the 2018 Physical Activity Guidelines for Americans, an adult with a busy work schedule is most likely to increase his or her physical activity by making small lifestyle changes. The guidelines recommend that adults should move more and sit less throughout the day, and engage in at least 150 minutes of moderate-intensity aerobic activity per week, or an equivalent combination of moderate- and vigorous-intensity activity. By finding small pockets of time to exercise, such as taking a brisk walk during lunch breaks or using the stairs instead of the elevator, a busy adult can easily incorporate physical activity into their daily routine.