Barbell rows are a strength training exercise that primarily targets the muscles in the back, particularly the latissimus dorsi, rhomboids, and trapezius. To perform a barbell row, you start by bending at the hips and knees while holding a barbell with both hands. The barbell is then pulled towards your torso, engaging the back muscles, before being lowered back to the starting position. This exercise can be performed with various grips, such as overhand or underhand, to emphasize different muscle groups. Proper form is essential to avoid injury, so it's important to keep your back straight and core engaged throughout the movement.