Do Vio to Max and Threshold Style Workouts Really Work?

hunter: What is the difference between vio to max and threshold intervals? Rob: I think there's no debate about thresholds. Hunter: Do you want to throw up for five minutes, or kind of suffer for 20? Rob: Why sort of suffer for an hour when you can sort of suffering for an hour? hunter: Well, i say you got to do both, or i got toDo both.