By Newsbreak Producer Taliesha Naidoo - The heart is a muscle that needs exercise to stay fit, but according to a study by the World Health Organisation (WHO) - almost 40% of South Africans are physically inactive. The Heart and Stroke Foundation South Africa says inactivity doubles the risk of a heart attack. As September marks Heart Awareness Month, the Foundation is urging South Africans to get heart healthy. Haley Cimring - Nutrition Science Team Leader at the Foundation - says small steps make a big difference on your heart health. Cimring explains the role physical activity plays in managing your cholesterol...