Barbell kneeling squat. An isolation exercise. Target muscle: Gluteus Maximus. Synergistic muscles: Hamstrings, Adductor Magnus, and Quadriceps (Rectus Femoris, Vastus Lateralis, Vastus Medialis, Vastus Intermedius). For your own safety, please use a Smith machine or a power rack for this exercise. Note that this exercise activates your glutes more than does any other squat variation. Please read "Comments and tips" on site to learn more.