Duties vary greatly depending on what particular field of exercise one decides to go into.
They range from organizing exercise programs for people to actually leading and teaching people how to become physically fit. Anywhere from five dollars an hour and up depending on level of education. Ask your librarian or counselor for the Occupational Outlook Handbook and the National Encyclopedia of Associations. Occupational Outlook Handbook, SIGI-Plus, MO View, Dictionary of Occupational Titles.