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more than 60% of adults do not participate in sufficient levels of physical activity
80% of cardiovascular disease deaths occurred in low- and middle-income countries. The prevalence of those suffering from overweight and obesity

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A heart attack happens if the flow o oxygen-rich bloodto a section of heart muscle suddenly becomes blocked and the heart can't get oxygen. Most heart attacks occur as a result of (CHD).

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A significant proportion of athletes die suddenly, physical activity as a trigger.
The 26th Bethesda conference January 1994 to formulate guidelines for participation in most competitive unless of the lowest degree of intensity

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The best exercise for your heart is aerobic activity. That means anything that works large groups of muscles such as your legs, arms and shoulders.

Swimming, brisk walking, running, cycling, dancing and even digging your garden are all types of aerobic activity.

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People with heart problems should always check with their doctor or heart specialist before starting any exercise programme.

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Coronary heart disease is caused when the coronary arteries become narrowed by a gradual build-up of fatty material called atheroma This can cause angina (chest pain). Or, if a coronary artery becomes blocked by a blood clot, it can cause a heart attack.

• high blood pressure
• high cholesterol levels
• being overweight
• diabetes, and
• having a family history of coronary heart disease.
Physical inactivity
Smoking

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Cholesterol is a type of fat found in the blood. There are two types which are LDL (low-density lipoprotein) cholesterol and HDL (high-density lipoprotein). LDL cholesterol is the 'bad fat' and HDL cholesterol is the 'good fat'

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having high levels of cholesterol increases the risk of heart attacks and strokes. This is because it builds up as a fatty deposit on the walls of veins and arteries, decreasing the room the blood  has to flow through them.

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Ways in which exercise can effect cholesterol

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Ways in which exercise can effect cholesterol

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Some studies have shown that exercise can change your LDL cholesterol. Smaller lipoproteins, such as small, dense LDLs, have been associated with contributing to cardiovascular disease, but having larger LDL particles do not carry this same risk. studies have shown that increasing exercise increases the particle size.

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exercise can enhance the transport of cholesterol from the bloodstream to the liver, where it will eventually be filtered out of the body.

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http://www.drsamrobbins.com/cholesterol/does-exercise-lower-cholesterol/

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Cardiac Output is the volume of blood pumped out by the heart ventricles per minute.

Cardiac Output (Q) = Stroke Volume (SV) X Heart Rate (HR)

If heart rate or stroke volume increases the cardiac output will also increase.

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during exercise there is a large increase in cardiac output due to an increase in heart rate and an increase in stroke volume.

Cardiac output will also increase as the intensity of exercise increases until maximum intensity is reached and then it plateaus.

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When the cardiac muscle becomes bigger and stronger, this is know as cardiac hypertrophy. this will have an important effect on stroke volume, heart rate and therefore cardiac output. A bigger, stronger heart will enable more blood to be pumped out per beat.

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At rest, cardiac output for both the trained and untrained performer stays the same. during exercise, the increase in maximum cardiac output will have huge benefits for the trained performer as they will be able to transport more blood to the working muscles and therefore more oxygen.

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It helps your heart muscle become more efficient and better able to pump blood throughout your body. This means that the heart pushes out more blood with each beat, allowing it to beat slower and keep your blood pressure under control.

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The major risks that you can control include:

smoking

High blood pressure

High blood cholesterol

Overweight or obesity

An unhealthy diet (for example, a diet high in saturated fat, trans fats, cholesterol, and sodium)

Lack o physical activity

High blood sugar