Barbell curls are a popular strength training exercise primarily targeting the biceps. To perform a barbell curl, stand with your feet shoulder-width apart, holding a barbell with both hands, palms facing upward. Keep your elbows close to your body and curl the barbell upward by bending your arms, then lower it back to the starting position. This exercise helps build muscle mass and strength in the upper arms. It's important to maintain proper form to avoid injury, ensuring that your back remains straight and your movements are controlled. Incorporating barbell curls into your workout routine can enhance overall arm development.