The Reverse Lunge works all the major muscles of the legs.  Quadriceps, hamstrings, and glutes.  When performing the Reverse Lunge, make sure to bring both legs to 90 degree angles.  When you are coming up out of the movement, you want to make sure you are pushing up through your front heel and don’t let your knee go beyond your toes.  Always keep your upper body in an upright position (no bending over or leaning forward).  If you have trouble balancing with this exercise, start by holding on to a chair or put your hand on a wall to stabilize yourself.  You can perform all your reps with one leg first or you can alternate each side.