The American College of Sports Medicine recommends you get your heart rate up and sustain it for 20-60 minutes, at least 3-5 days a week.
The American College of Sports Medicine recommends you get your heart rate up and sustain it for 20-60 minutes, at least 3-5 days a week.
美国运动医学学院推荐：每周有3-5天，提高心跳频率并保持20-60分钟。