In 2008 the U.S. Federal Government issued new exercise guidelines for the general population. A recent survey examined the reduction in mortality experienced by people who followed these recommendations. The study was based on nearly 250,000 people.   

People who met the aerobic activity goals experienced substantial survival benefits. Interestingly, those who benefited most were sick people with chronic medical conditions who forced themselves to exercise in spite of their disability.

Aerobic exercises reduced mortality the most. Strengthening exercises using weights alone did not prolong life but did provide some additional survival benefits to those who were already engaged in aerobic activities. The benefits of exercise were most pronounced for adults who had at least one chronic condition.