Walking is good cardio exercise — if you go at a brisk pace of at least 3 miles per hour. Cardio or aerobic exercise works your large muscles over and over and pushes your heart and lungs to work hard. Over time, this makes your heart stronger — it's a muscle, after all — and more efficient.
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Answer:
Walking is good cardio exercise — if you go at a brisk pace of at least 3 miles per hour. Cardio or aerobic exercise works your large muscles over and over and pushes your heart and lungs to work hard. Over time, this makes your heart stronger — it's a muscle, after all — and more efficient.
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