Final answer:
The optimal cardio sessions per week for cardiorespiratory fitness should be at least 3 days a week, consisting of 150 to 300 minutes of moderate-intensity exercise per week.
Explanation:
The recommended number of cardio sessions per week in an effective cardiorespiratory fitness program is at least 3 days a week. This should consist of 150 minutes to 300 minutes a week of moderate-intensity or 75 to 150 minutes a week of vigorous-intensity exercise. The activity can be broken down into sessions lasting at least 10 minutes each.
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