i had no idea what it was, so i looked on the wiki. a branded and licensed (i.e. for profit) exercise thing. kinda like crossfit, which is more about the workout regimen and less about the competitions. this one started with the competitions but all those competitors and wannabes still have to workout and train so there is several categories of licensed facilities for that. the routine of a run followed by a workout exercise and then repeat several more times is very similar to some of my varsity track workouts back in the 1980s