Lunges are an effective and common way to strengthen your legs. A classic lunge performed by stepping forward with your legs one at a time. With a little variety you can involve more legs and thigh muscles in the workout by stepping back with each leg. This provides more challenges to more muscles in your lower body. Quadriceps is the major muscle that works in reverse lunges. Including hips and knee reverse lunge exercise stabilizes the legs as well as improves balance and coordination. You can add weights in lunges to increase the challenge and get the maximum benefits of the workout.