Final answer:
The specific proportion of Australian adults who met both physical activity and muscle strengthening guidelines in 2017-2018 is not provided in the reference material. However, we do know that following the recommended physical activity and muscle-strengthening activities is crucial for health and that most Americans do not meet these standards.
Step-by-step explanation:
The question of what proportion of Australian adults met both the physical activity and muscle strengthening activity guidelines in 2017-2018 pertains to data on health and exercise habits. The correct answer, based on the specific data provided, is not included in the reference information. Nevertheless, we can discuss the importance of meeting physical activity guidelines. The 2018 Physical Activity Guidelines recommend that adults engage in at least 150 minutes of moderate-intensity aerobic activity or 75 minutes of vigorous-intensity activity per week, in addition to muscle-strengthening activities on 2 or more days a week. Despite these recommendations, a 2018 report from the American Heart Association indicated that 8 out of 10 Americans do not meet these guidelines. It is essential to encourage individuals to meet both the aerobic and muscle-strengthening recommendations to improve overall health and reduce the risk of chronic diseases.