I know the Eveverlast boixing workout is a group fitness class that is offered through 24 fitness clubs
It is a formated class, with moves that go with each song. They are drill type classes. The music is very fast paced.
Everlast has replaced many of the TK I(Turbo Kick)classes on the schedule in alot of areas. The idea behind the class is to make it less dancy, more sporty, and appealing to men,as well as women.
I know all of this because my sister works for 24. She said the workout is fun, but not that well received in her area.