I won't get into the article too much, but basically it suggests that all crunch (trunk flexion) exercises are harmful to the lower back and should no longer be practiced.
One of the most interesting things about my profession is the "in" factor. Body building was "in" in the 60's with the introduction of Nautilus (of course primarily practiced by men). The 80's brought us Aerobics only to be pushed aside by indoor group cycling in the 90's.
Of course I don't have to tell you that pilates, yoga and kickboxing are the total "in" right now.
The same "in" factor applies to exercises as well. 15 years ago we were told that situps and ballistic type stretching were harmful and should absolutely be avoided. And now they are back.
So when should we listen to what? It's simple really. All you have to do is use your common sense. Why would crunches be harmful to our backs when one of the primary actions of the abdominals muscles is to do just that? When you get out of bed or go from a lying to seated position, do you not perform a crunch type movement?
Now hold on... Let's not forget to point out the other side of this type of reasoning. There are many different scenarios where crunches would be contraindicated as in the case of an abdominal hernia, separated abdominal muscles or a low back condition to name a few. You have to listen to your body even if you are working with a trainer.
Always remember that there are endless ways to work a particular muscle. And if something doesn't feel right, then you should probably stop doing it. A knowledgeable trainer should easily find an alternative for you that is safe.
The verdict? Although not the most efficient way of getting that six-pack, crunches are not evil.
-Sherry Shaban BSc, CAT(C), CSCS