Assignment task:
23-year-old Rehan exercises for 1 hour a week. His routine includes moderate-intensity aerobic exercise and weightlifting three days a week. What changes should he make to meet the physical activity guidelines? A. Rehan should continue with his aerobic exercises but he should reduce his weightlifting to once a week. B. Rehan's current exercise routine meets the physical activity guidelines. C. Rehan should continue with his aerobic exercise routine but he needs to lift weights four days a week. D. Rehan should increase his aerobic activities to 21 hours a week and do weightlifting all seven days of the week. E. Rehan can continue with his current exercise routine, but he should add an hour of vigorous-intensity exercise.