IN MODIFYING THE EFFECTS OF PHYSICAL CONDITIONING & EXCERCISING, IT IS ESSENTIAL TO DISTINGUISH BETWEEN FITNESS & HEALTH, AND BETWEEN SKILL & FITNESS.  HEALTH IS THOUGHT BY SOME PEOPLE TO BE THE HEALER OF DISEASE.  IT IS THE CAPACITY OF ALL BODY ORGANS & SYSTEMS TO FUNCTION AT HIGH LEVELS.  FITNESS RELATES TO GOOD PERFORMANCE & SURVIVAL.
    USUALLY, BUT NOT ALWAYS, GOOD FITNESS REQUIRES GOOD HEALTH.  SOME EXCEPTIONS ARE IN SPORTS COMPETITION.  MANY ENTHUSIASTIC & COMPETITIVE ATHLETES, EVEN WHEN SICK OR HURT, HAVE WON CONTESTS AND BROKEN WORLD RECORDS.  IN PAST OLIMPICS, ATHLETES SUFFERING FROM MANY PHYSICAL DISORDERS SUCH AS INFECTIONS, DYSENTERY, FLU, AND BROKEN BONES, HAVE PERFORMED WITH SUPERIOR SKILL.
    IN CONTRAST, THERE ARE PERFECTLY HEALTHY PEOPLE WHO ARE UNABLE TO PERFORM HARD WORK BECAUSE THEIR BODIES ARE POORLY BUILT UP.  GOOD PERFORMANCE IS A GOOD INDICATION THAT THE PERSON IS PHYSICALLY FIT & IN GOOD HEALTH.