Want an exercise that works adductors (inner thighs), abductors (outer thighs) and glutes? Why not try multi-directional lunges. This exercise hits every one of those muscles as well as training balance and core stability. Think of one repetition as a clock face:
Start out by doing 3 sets of 12 repetitions with no weight. If you are more advanced, or as you improve, you can start doing it with a bar rested across your shoulders.