The barbell row works your upper body, and it’s one of the best movements for building a strong back. It works a few muscles called agonist, stabilizer, and synergist muscles.

These are called synergist muscles, and help the primary mover to achieve motion. Next, there are two types of contraction — isometric and isotonic.

When I started working out I was not sure which exercises worked which muscles and how different exercises play in to each other. To learn more about this subject I started reading about the different ...