Check out the weekly text article "Impact of Execise Training on Cardiovascular Risk and Anti-Risk Factors in Adolescents" by Majid Koozehchian. "Childhood and adolescence are critical periods in the formation of cardiovascular risk factors. Many cardiovascular diseases are related to such risk factors as high levels of total cholesterol, low-density lipoprotein (LDL), and triglycerides (TG), as well as low levels of high-density lipoprotein (HDL). The causes of cardiovascular risk factors are manifold, involving environment, lifestyle, and genetics."