To such unexpected conclusion was made by researchers from the University of jyväskylä. They conducted an experiment on laboratory mice. The animals were divided into two groups. The first group through a variety of ways motivated to keep moving, the rest of the rodents level of physical activity was at a normal level.
It turned out that excessive physical exertion does not increase the life span of animals. Moreover, muscle strain is in some cases caused serious disruption of organs and systems.
It is difficult to answer whether the results of experiment apply to human beings. One thing is for sure: regular exercise of moderate intensity is one of the keys to prevention of most diseases of old age. Definitely, a lot depends on heredity, but much of the responsibility for their health lies with us.