Almost all YouTube workouts I've watched are suitable for a beginner to intermediate level," reassures Warburton. "However, there isn't much in the way of more advanced work, suitable for those who have been practicing for a while and would like to expand their exercise repertoire. "That said, it's for good reason: the advanced (or classical exercises), are far more complicated to cue and require hands on corrections and the watchful eye of an experienced instructor, who can safely guide you in and out of the exercises.