According to health experts, the human body will quickly adapt to new conditions, and will operate changes in a matter of days after settling for a new lifestyle. When you take up exercising, the first organ that will perform better is the heart, which will pump at a slower rate, due to the higher amount of blood in your organism. When physical activity is curtailed, the human heart has to adjust to a lower blood volume, thus increasing its rate by 4 to 15 beats per minute.
As a general rule, the more you train the more your organism tends to stay in the same shape for a longer time. The best example in this regard is what happens to professional athletes, who still display a very good physical conditions months, even years after they have retired.
Normally, the first signs of your body going back to hibernation will show after 7 to 10 days after you stop exercising.
But exercising is not only about the physical condition, it also plays a crucial role in a person’s mental wellbeing. The chemicals released during exercising are linked to a good mood and, according to some specialists, may even help in combating depression. This is mainly attributed to dopamine, a chemical released in the organism during times of great physical strains. For vigorous athletes, a sudden activity stop, may lead in a drop of dopamine levels, causing feelings of nervousness and, even light depression.