How does exercise prevent heart disease?

Exercise lowers blood pressure, which reduces strain on the heart, can aid in transporting fats away from the arteries and to the liver for processing, and improves circulation by preventing blood clots that can cause a heart attack or stroke. On top of all this, exercise increases fat loss and weight loss. All of these factors help to prevent heart disease.

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I'm not sure if this is correct or not but exercising keeps your heart healthy and in shape thus preventing diseases like heart disease which are caused by not being physically active enough. You should try to exercise for 60min a day.

When you exercise blood moves, the body sweats, your heart beats faster, and in general you are moving through blood transportation, LDL, HDL, and triglycerides to be rid out of the body. Do this enough and you have a cycle of keeping HDL fat UP which cleans out the arteries etc. Exercise is one way of getting high HDLs... Now do your homework because I have been through it and you need to learn

.....along with a healthy diet, keeping your weight under control, don't smoke or drink.