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Core muscle is highly important inside the body which got the job in protecting the spine and many more things.
 
Even the smallest movement requires the core muscle, that's how important it is for us as human.

Of course, training this muscle is not only good to shape the ripped abs, but there are noticeable things that you can see from outside, rather than just good looking six pack.

Moreover, the type of the training is not just about push up or any similar bodyweight movement, and you can also try many other alternatively. But most importantly, when you do it right, then you can try to become the fittest person at your home.

With weaker core muscle, it's very easy for a person to suffer from injury. This is why expert recommends for this person to strengthened the core first, instead of jumping directly in building the six pack.
 
Moreover, there's no guarantee that you can build better abs muscle when at first place you don't have strong body to begin.

As explained before, usual activity such as standing, sitting and many others involve normal core muscle.
 
And perhaps you won't feel the importance of such muscle unless you can feel the bad effect when you don't do enough exercise activity.