Sasha looked at her own results. Her "diamond test"—pressing her back to the wall and seeing if her hand could slide through the gap at her waist—showed she was doing well. However, Denis realized he needed to stop slouching over his phone. Likely carrying his heavy backpack on only the
Denis backed up to the wall. Sasha checked for the five points of contact that indicate healthy posture: The back of the head The shoulder blades The buttocks The calves However, Denis realized he needed to stop slouching
The classroom smelled of chalk dust and floor wax as the Grade 8 biology students gathered for their favorite kind of lesson: a lab day. Today's mission was "Laboratory Work: Detection of Posture Disorders."
Mr. Petrov stood by the whiteboard, where a diagram of a perfect human spine was sketched in green marker. "Today," he announced, "you aren't just students. You are orthopedic specialists."
