Do you walk your dog once or twice a day? You're already on your way to a healthier heart. A lack of physical activity is a major risk factor for developing heart disease. But according to the American Heart Association, even moderate-intensity activities, like walking for pleasure, can have long-term heart benefits if done daily. Even people who start exercising regularly after a heart attack have higher survival rates. So aim for at least 30 minutes of walking a day. If you don't have a dog, take a friend.

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