Sit in your chair the way you think a typical guy sits. Now sit the way a girl does. In the first posture, most people throw open their arms & legs, lean back & look chill. In the second, people sit stiffly upright, legs crossed, arms folded. The exercise is about way more than sitting: it’s about the different rules boys & girls grow up with, & about how much space we’re expected to take up — with our bodies, our voices & our appetites.