After 26 years, I am still practicing what I preach.
I have not missed a day from work because of illness since 1956.
It's easier and more cost effective to maintain good health, than to regain it once it's lost. 
Exercise can't counteract the damage being done to your body while you continue to smoke. What exercise can do is help you kick the habit.
I think investments in general related to the exercise industry are going to be good for a long time. ![Kenneth H. Cooper quotes: [Walking's] overwhelming advantage is that it can be done by anyone, anytime, anywhere-and it doesn't even look like exercise.](http://www.wisefamousquotes.com/images/kenneth-h-cooper-quotes-773270.jpg "Kenneth H. Cooper quotes: [Walking's] overwhelming advantage is that it can be done by anyone, anytime, anywhere-and it doesn't even look like exercise.")
[Walking's] overwhelming advantage is that it can be done by anyone, anytime, anywhere-and it doesn't even look like exercise.
Aerobic dancing is already adjusting to injury problems and will probably phase out to some extent.
I don't criticize weight training - as long as it is not a substitute for aerobic training.
You have to run 75 to 100 miles a week if you expect to break the four-minute mile. 
The reason I exercise is for the quality of life I enjoy. 
Fitness is a journey, not a destination; you must continue for the rest of your life. 
Since then, I have not missed five consecutive days in getting some type of aerobic exercise, mostly jogging. 