This document provides an overview of muscles and why exercising them is important. It discusses where muscles are located in the body and some of the major muscle groups. It then explains how muscles work by contracting and moving bones via attachment through tendons. It notes that ligaments connect bones and hold organs in place, while joints allow bones to come together for motion. Finally, it lists reasons why exercising muscles matters, such as preventing unrealistic beauty standards, reducing dizziness, relieving stress, forming a lifelong habit, and preventing injuries.