Why is exercise so important to your health?

Why is exercise so important? 

The heart, like our other muscles, needs to be kept in good condition. The regular pumping that keeps us alive for most people this means blood pumping in and out of the heart about 60 to 80 times every minute is not enough to keep the muscle tuned and the coronary arteries clean. Tuning up the heart is simple: you need to increase its number of beats or pumping cycles at least a few times a week for a minimum of twenty to thirty minutes each time. If you are not well enough to engage in strenuous activity, even some easy physical activity like walking for a reasonable length of time will help the tune-up process.
Using muscles for physical tasks was a daily necessity in primitive societies. Humans were able to endure long bouts of exercise and exposure to heat and cold while seeking and gathering plants, hunting, and fishing. Skeletal analyses of primitive human remains indicate that the early human was an extraordinarily active creature whose bones were as strong as those of a modem conditioned athlete. From this we can infer that the early human’s cardiovascular system was in pretty good shape as well.
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The sedentary lifestyle typical of contemporary society is a major risk factor for heart disease. Inactivity contributes to obesity, diabetes, and high blood pressure, which we already know are correlated with heart disease and lead to fatigue, stress, and often depression.

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