I am a personal trainer and I love doing Pilates. You could do squats and lunges and crunches all day long but the way your muscles are worked during a Pilates workout totally trumps the traditional gym style workout. You work all of your stabilizing muscles in Pilates-- the hips, inner/outer thighs, glutes, core/abs, and lower back are the main muscle groups that are targeted. They are called the Powerhouse. It is important to work these muscles groups, and not just the big ones like the quads, hamstrings, etc, because the stabilizing muscle groups are the ones that help us maintain balance, posture, stability, and stamina as we age. It also aids in flexibility. If you incorporate Pilates into your weekly routine, say 2-3 times per week, and continue with it, you will feel more grounded and stronger in a way that can't be duplicated by traditional strength training. Enjoy!