Your body makes various physiological adaptations if you perform regular stamina-building exercise. The heart muscle becomes stronger and the pumping capacity of the heart also increases. This allows more blood to be pumped around your body per heart beat. Now because of the fact that heart beats more effectively and efficiently, it beats less often. All those people who start a programme of regular exercise in their daily routine will notice that their pulse becomes slower even when they are resting and the pulse gets back to normal rate more quickly after they exercise.

Check your condition by measuring your resting pulse rate early in the morning, before getting out of the bed. If it is above 100 for a woman or above 90 for a man, it’s time to see your doctor before starting your regular stamina exercises. The doctor may advise against certain activities.

Regular stamina-building exercise also increases and expands the lung capacity. Thus, allowing more oxygen in and removing waste carbon dioxide more rapidly, so that you do not get out of breath as quickly. Blood flow also improves through the lungs and around the body. It thus enables more freshly oxygenated blood to reach the muscles, organs and tissues throughout the body.

To achieve the benefits, the heart, lungs and circulation must work harder, little by little, over a period of weeks and months until they, and you, are healthier and fitter than when you started out. Physical activity exercise sessions that can be sustained for at least 20 minutes (ideally a little longer) and done at a moderate level are the key components. Health and fitness experts generally recommend a minimum of 30 minutes of sustained, moderate physical activity at least three times a week.

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The lungs are strengthened by regular exercise. Your lungs are, in effect, twin balloons that have a porous lining to absorb the oxygen you need for energy. The more they can inflate, the more oxygen they can absorb. When you are inactive for long periods, you tend to breathe in a shallow way, inflating your lungs only enough to stay alive. This can leave you feeling tired and listless much of the time and make you vulnerable to chest infection.

Regular physical activity improves the elasticity of lungs, which allows them to inflate with greater ease.

During exercise your lung capacity increases five to seven times. Some of this increased capacity stays with you when you are not exercising, so you breathe deeper to produce more power for the muscle and fuel for the brain.