The crunch exercise is backbone of abdominal training. It develops muscles of abs to help you build that much-desired six-pack. But did you know that there is a way to do crunches that can actually decrease size of your waist? The key to this technique is top position of crunch where your abdominals are contracted as hard as they are able to.
When you’re in this top position, I want you to breathe in and out slowly a few times. Try to relax every other muscle except abs. This breathing in and out will intensify contraction (as you will find out very rapidly).
Here’s how it works:
The muscles of abdomen are arranged in layers around your midsection, similar in concept to rings in a tree. While you are contracting rectus abdominus (the top-most front layer of your abs, also known as your six-pack) continuously, deeper abdominal muscle fibers are relaxing and contracting each time you breathe.