Are hamstrings the primary muscle used during a lunge?

While the hamstrings are involved in a lunge, they are not the primary muscle used. The primary muscles engaged during a lunge are the quadriceps, glutes, and hip flexors. The hamstrings play a supportive role in stabilizing and assisting the movement, particularly during the lowering and lifting phases. Overall, lunges target multiple muscle groups, with the emphasis on the front leg's quadriceps and glutes.