Understanding the Muscles Targeted by Smith Machine Squats The Smith machine squat is a popular variation of the squat exercise. Unlike the free barbell squat, the Smith machine squat has a fixed bar path, which reduces the need for balance and stabilization. This feature allows lifters to focus more on the muscles being trained. Here are the primary muscles worked during a Smith machine squat: Quadriceps: Also known as the quads. They are located on the front of the thigh and are responsible for extending the knee joint. The quads are a crucial muscle group for lower body strength and power. The best exercises for building your quadriceps are the squat, Bulgarian split squat, leg press, and leg extension. Glutes: The glutes, or the muscles of the buttocks. Strong glutes not only provide aesthetic benefits, but they also play an essential role in hip extension, which is necessary for many daily activities. The best exercises for building your glutes are the squat, barbell hip thrust