The document summarizes a lesson on flexibility that includes definitions of flexibility and range of motion, benefits of flexibility, muscle groups that require flexibility, and assessments to measure flexibility in the arms, legs, trunk, and ankles. It provides instructions for performing flexibility assessments including the arm lift, zipper, trunk rotation, knee to chest, and ankle flex assessments.

1. Chapter 10: Flexibility Lesson 10.1: Flexibility Facts Self-Assessment 10: Arm, Leg, and Trunk Flexibility