Reading books on health can be very helpful.  One can get lots of pointers on how to be healthy.
In one book, the author mentioned that one needs to work hard on one's education; one needs
to work hard on one's career; and one needs to work hard to maintain good health.  I really liked
the last point - that one must work hard for one's health.  Your health won't take care of itself,
nor can one maintain good health by just taking pills.
One must really work those muscles by exercising; pump the heart hard by jogging. running or
the treadmill in the gym.  Yes, one must literally "sweat it out" - and it feels great, with the sweat
oozing from your brows.  One feels invigorated, on top of the world.  It's a good feeling - so to all
those couch potatoes, go out and work those muscles - use it, or lose it.