Walking is an easy way to reduce your risk of cardiovascular disease. The American Heart Association recommends at least 150 minutes of moderate exercise or 75 minutes of vigorous exercise each week. Thirty minutes a day, five times a week is an easy goal to remember. However, you will also experience benefits even if you divide your time into two or three segments of 10-15 minutes per day. Walking has the lowest dropout rate among other choices for physical activity, and it's free.