Mateo, age 15, does his homework while listening to his mp3 player; he also keeps his cell phone on his desk so that he can text his friends at the same time. mateo is engaged in which is teens typically perform

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.