Question

multiple choice question
the physical activity guidelines for americans 2018 recommends that adults engage in ______ for substantial health benefits.

• moderate intensity aerobic physical activity for about 90 minutes a day
• vigorous-intensity aerobic physical activity for about 1 hour a day
• vigorous-intensity exercise for at least 3 hours a week
• moderate-intensity exercise for 150 to 300 minutes a week

Explanation:

The Physical Activity Guidelines for Americans 2018 states that adults should do moderate - intensity aerobic physical activity for 150 to 300 minutes per week (or 75 to 150 minutes of vigorous - intensity) for substantial health benefits. Let's analyze each option:

• Option 1: 90 minutes a day of moderate - intensity would be 630 minutes a week, which is more than the recommended 150 - 300 minutes for moderate - intensity. So this is incorrect.
• Option 2: 1 hour a day of vigorous - intensity is 420 minutes a week, while the recommended for vigorous - intensity is 75 - 150 minutes a week. So this is incorrect.
• Option 3: 3 hours a week of vigorous - intensity is 180 minutes a week, but the recommended range for vigorous - intensity is 75 - 150 minutes a week. So this is incorrect.
• Option 4: 150 to 300 minutes a week of moderate - intensity exercise matches the guidelines.

Answer:

D. moderate - intensity exercise for 150 to 300 minutes a week (assuming the options are labeled A, B, C, D in order as presented)