lower back would be most machines at the gym (if you go to one) that work the lower back/glutes. I also feel the burn in my lower back when doing lunges.
As far as crunches go, you might want to get a stablity ball and use that, it helps your back and having to balance tones the muscles even more. Regular crunches only work the upper abs and miss the lower abs and obliques. You can do site crunches to work your obliques and hip lifts to work your lower abs.
Are you putting your hands behind your head? If so, be sure you're not pushing your neck forward to where your chin is close to your chest, your neck should be straight. This is really bad for your back. If you are doing this put your finger tips on your temples or cross your arms over your chest.
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