I believe that there are a lot of people that take virtually no exercise and will live a relatively long life. As long as they stay on that couch and do not attempt to run for that bus. I would suggest that longivity is in the genes. Exercise will give you a much better quality of life for the amount of years that you have and stave off disease that would kill you earlier. Hard/extreme daily physical exercise IMHO is not always a good thing, you just need to keep moving. Look at nature, the slow steady movers [elephants/turtles] last the longest. Cheetahs? No chance. Pro athletes do not have a lifespan longer than the average.
Jim