Recent findings show that nationally in the United States, twice as many African American students as white American students are classified as having mild intellectual disabilities, which is a difference attributed primarily to .

2. every fitness program should include a. a longer warm-up period than cool-down period. b. a warm-up, a primary conditioning period, and a cool-down. c. at least 60 minutes of cardio activity. d. at least 15 minutes of vigorous activity.