Oxygen

I hear that the taking in of large doses of oxygen can possibly reverse the onslaught of disease, prevent illness, and improve overall health.  What if there is something to this?  How do you get large doses of oxygen? It is called "exercise."  So why don't more people try it?  I think it starts with gym class or the lack thereof.  You have a bad experience in gym.  Or you have no formal experience in exercise when a child.  You "play" maybe, or try out in a sport competition.  You find you have no talent.  No one teaches you that exercise need not be team or competition oriented.  Just sweat.  Move your limbs.  This is foreign to many of us when we are young.  We grow up seeing exercise as optional.  Drinking, eating sweets, sitting at the computer are not optional.  I think that spiritual exercise is seen like physical exercise for many of us.  It is optional.  Either way, you die miserably on the inside or the outside.  We all die, but does it have to be due to our own neglect?