To Achieve and Maintain Cardiorespiratory Fitness, the American College of Sports

To achieve and maintain cardiorespiratory fitness, the American College of Sports Medicine recommends

A) 10 to 20 minutes of intensive aerobic activity per session.
B) 20 to 30 minutes of moderate-intensity aerobic activity per session.
C) at least one hour of aerobic activity per session.
D) the longer the session, the better the program.