Have you mastered the box step? Not the pattern dancers practice when learning to waltz, the catalog box dance. If you don’t know what I’m talking about, the box dance is what your customers do — or ...

(a) Using a mid-level box, step one foot flat on to the surface, pushing your chest forwards to engage your glutes (translation: clench those bumcheeks, girl) (b) Driving through your heel, push up on ...