According to the 2018 Physical Activity Guidelines for Americans, adults should engage in at least 150 minutes of moderate-intensity aerobic activity or 75 minutes of vigorous-intensity aerobic activity each week, along with muscle-strengthening activities on 2 or more days a week.
Let’s assess Arnold's workout plans:
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Golfs for 2 hours every Sunday:
- Total = 120 minutes (2 hours). This does not meet the minimum recommendation of 150 minutes.
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Bikes for 45 minutes a day, 3 days a week:
- Total = 45 minutes x 3 = 135 minutes. This does not meet the minimum recommendation of 150 minutes.
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Runs for 15 minutes a day, 6 days a week:
- Total = 15 minutes x 6 = 90 minutes. This does not meet the minimum recommendation of 150 minutes.
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Walks for 30 minutes a day, 5 days a week:
- Total = 30 minutes x 5 = 150 minutes. This meets the minimum recommendation of 150 minutes.
Conclusion: The workout plan that meets the minimum recommendation is: He walks for 30 minutes a day, 5 days a week.