Maybe you know someone who suffered from polio as a child, or maybe you yourself did. 25% of people who had polio can start to see signs and symptoms of the disease once they reach the ages of 50-60 years.
Post Polio Syndrome is a degenerative disease that has no cure. You may not want to exercise due to the fatigue and muscle pain that you experience, but research shows that some types of exercise are important in keeping you healthier than you would be without it.
Check out these links for more info: http://www.ncpad.org/exercise/fact_sheet.php?sheet=107§ion=812