If I had a dollar for every time someone asked me if crunches are bad for you, I would be one rich personal trainer!
So, are crunches bad for you?
The answer: Yes and No.
If you have a hernia, disc issue or abdominal separation, then you should NOT be doing crunch exercises. Doing so will only lead to further pain and injury.
If performed with proper form – and providing you are not doing a million of them every day – the crunch can be all right.