3. Seated hip abductor machine
You think you’re working the outer thighs in hopes of blasting away those saddlebags. Unfortunately, the bad news here is twofold: When you’re seated in this position, the abductor muscles of the outer thighs aren’t actually doing the work. Instead, the piriformis muscle, a small deep hip muscle, is. And when this guy is worked too hard, it can get angry and pick on its neighbor, the sciatic nerve, possibly leading to painful sciatica.