According to the 2018 Physical Activity Guidelines for Americans, adults should aim for at least 150 minutes of moderate-intensity aerobic activity each week, which can also include 75 minutes of vigorous-intensity exercise or a combination of both.
Let's evaluate Arnold's weekly workout plans:
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Golfing for 2 hours every Sunday: This totals 120 minutes, which does not meet the minimum recommendation.
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Biking for 45 minutes a day, 3 days a week: This totals 135 minutes, which does not meet the minimum recommendation.
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Running for 15 minutes a day, 6 days a week: This totals 90 minutes, which does not meet the minimum recommendation.
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Walking for 30 minutes a day, 5 days a week: This totals 150 minutes, which meets the minimum recommendation.
Therefore, Arnold's workout plan of walking for 30 minutes a day, 5 days a week meets the 2018 Physical Activity Guidelines for Americans.