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.
As of 2015, Cats is the third longest-running show in Broadway history and was the longest running Broadway show in history from 1997-2006, surpassed only by The Phantom of the Opera and Chicago.