Denise Austin
Denise Austin is one of the most known female fitness instructors out there, who has helped a lot of people get in shape back in the ’90s and all the way up to today. She did this through various distribution methods such as using books, VHS tapes, and DVD workout videos. Yes, she’s used all mediums. She served two terms as the President of the Council of Physical Fitness and Sports, and has even helped launch the food pyramid guidance system in the U.S. at the age of 61.