ACE and NASM both does a great job for the general population, but NASM puts a slight bit more emphasis on corrective exercise. However, any of the certifications you have mentioned will get your foot into the door.
Broadway theatre, commonly known as Broadway, refers to the theatrical performances presented in the 41 professional theatres with 500 or more seats located in the Theater District and Lincoln Center along Broadway, in Midtown Manhattan, New York City.
On June 13, 2006, the Broadway production moved to the Minskoff Theatre to make way for the Walt Disney's Mary Poppins, where it is still running. The Lion King is now Broadway's fourth longest-running show in history at this time. The production has had a total of 33 previews and 7027 as of September 28, 2014. The musical has made a total of $1,094,936,075, making it the highest grossing Broadway musical in history.