There are lots of exercises to improve your abs and crunch and plank are the most popular ones among them. But which one is healthier? Let's compare them:
Crunch

It is right that crunch helps you have abs but keep in mind that you must do many reps for it. And it is not healthy as your spine shapes just opposite of it is natural way and you have extra press in your spine which may lead to disc injuries- especially herniated disc. And let's accept the fact that most of us do it in wrong way. We use our neck to stand and it results with intense neck pain.
Plank

While doing plank your spine has it's natural shape. So there is no health problem in this point. It improves your balance and strengthens your back, legs, and arms except your abs. Especially good for your weak shoulders.
The choice is yours!
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