Format Friday: Classic She’s the foundation of all things Pure Barre, specializing in small, isometric movements to strengthen and define muscles. If you haven’t already sign up for the 25th Anniversary Challenge, where you take 10 classes of our 5 formats (Classic, Define, Align, Empower, and Reform) in 30 days - sign up in the Pure Barre App! #purebarre25thanniversary #purebarreclassic