题目内容

According to the American College of Sports Medicine recommendation, cardiovascular exercise should be done a minimum of three times a week, a minimum of 20 minutes per session and should be done after a 5-10 minute warm-up (at a low intensity of 50-60% of max HR) and a 5-10 minute cool-down (at a low intensity of 50-60% of max HR) should follow. 从文中可知,热身练习与放松练习的运动强度是______ 。

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