Too much cholesterol in the blood can clog blood vessels. A blocked blood vessel supplying muscles of the heart can cause a heart attack and even death. Exercise lowers the bad cholesterol that clogs blood vessels and raises the good cholesterol that helps sweep out the blood vessels. Doing less than this will minimize your health benefits. Exercising 4 or more times a week will increase your health benefits.
Aerobic activities use large muscle groups for an extended period of time.
Aerobic exercise performed at moderate intensity makes the heart stronger. Hard, strenuous exercise is not needed to improve the health of the heart and lungs. Moderate and continuous exercise is. An aerobic exercise program makes the heart more efficient at delivering oxygen to the body's cells. It makes blood pressure go down.