How long must a person exercise to strengthen their cardiovacular system?
A person needs to exercise in their training/taret heart rate zone at least 20 minutes, at least 3 times a week. ANY activity that raises a person’s heart rate to their Training/Target Heart Rate Zone will strengthen the heart, that includes things such as weeding a garden, mowing a lawn with a push mower, taking the family dog for a walk, etc. The key is raising the heart rate to the Target Heart Rate Zone.