The 2018 Physical Activity Guidelines for Americans recommend that adults should engage in at least 150 minutes of moderate-intensity aerobic activity, or 75 minutes of vigorous-intensity activity, spread throughout the week. In addition, strengthening activities should be included on two or more days a week.
To determine if Arnold's weekly workout plan meets these recommendations, we need the specifics of his plan. If he has structured his workouts to include 150 minutes of moderate aerobic activity (like brisk walking) or 75 minutes of vigorous activity (like running), along with two days of muscle-strengthening exercises, then he meets the guidelines.
Please provide Arnold's specific workout plan, and I can help evaluate whether it meets the recommendations.