How much cardio should I do each day?

Everyday Health notes that the American Heart Association recommends engaging in moderately intense cardio for 30 minutes a day, five days a week. While each person's situation is different, these guidelines are for healthy adults under the age of 65 who are trying to maintain their health.

Everyday Health details further variations on this baseline recommendation by saying that it may be substituted with vigorous exercise 20 minutes a day, three days a week. A person who is attempting to lose weight may require 60-90 minutes of exercise, while beginners without much exercise experience at all may wish to start with two 20-minute sessions a week.