One of the phenomena of the human body is its ability to adjust to the demands of physical stress placed upon it. A person's level of fitness is imaged in the specific adaptations made to their shape, weight, body flexibility and movement, related to the level of physical activity habitually encountered in their work or leisure pursuits. The body can also respond by adapting to meet the demands of planned diverse physical activity. It may register an improvement in muscle strength, endurance, speed, flexibility and coordination, dependent on the type of activity being undertaken and the intensity and progressions entailed. Conversely, inactivity will produce adverse changes in these areas and a decline in the body's efficiency. The concept of progressively increasing the load and its training effect is known as the "overload principle". It can be defined as "the application of any demand or resistance that is greater than those levels normally encountered in daily life". The degree of intensity with which the system is overloaded wil affect the rate at which physiological adaptations take place. The closer the overload is to maximum, the greater the physiological improvement, provided that the overload is applied in gradual progressions and can be tolerated by the body for it takes time for the human body to adapt to additional exercise without experiencing fatigue or excessive muscle soreness. Below a certain stress level a person will show no improvement and merely maintain his current level of physical fitness. So yes, you should do overload training.
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