According to WebMD.com, one of the highest risk factors for Heart disease is a sedentary lifestyle, or a lifestyle that includes little to no exercise. Heart disease is a condition that can cause chest pain (angina), shortness of breath, and eventually heart attack and even death. If you get it, the prognosis isn't always good, even if you eat and exercise right--but this disease is preventable. Changing your sedentary lifestyle to a more active lifestyle is one of the best ways you can quickly improve your heart health.How to Exercise to Improve Heart HealthSo how do you change your sedentary lifestyle to a more active one?Begin with light physical activity for at least 10 minutes a day. Doctors recommend exercising anywhere from 30 to 60 minutes a day for five to six days a week, so you'