Crunches are great, but also do a few true sit-ups while you work your abs. Sit-ups have a bad reputation that isn't entirely deserved. Stay safe, do not try to do any of the anchored-feet type of sit ups. This particular variety of sit-ups can seriously strain your lower back.
Before using a particular bench in your workout, you should check the padding density by pushing your fingers down onto the cushion. You should pick a different machine if you can feel wood right underneath the padding.
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