Cardio is any type of exercise that can increase the heart rate and keeps it like that for a prolonged period of time. Dancing for 30 minutes would provide a cardio workout, i.e. option A.
What is a cardio exercise?
It can be known as cardiovascular exercise, cardio, or aerobic workout. It includes the increasing heart rate fast and deep breathing.
The best exercise for cardio is treadmill, dancing, swimming, etc.
Thus, the correct option is A.
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