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Lecture Notes

Another very simple way of determining the difference between a moderate and a vigorous activity is the talk test. If you can talk and sing easily while doing the activity, then you're doing an activity that would be considered pretty light. If you can talk but you'd have trouble singing, then you're likely doing a moderate-intensity activity, and if you can only say a few words before needing to catch your breath, then you're probably engaging in a vigorous form of physical activity.