The title...
Plus
Where do planks form muscles?
I watch a lot of youtube on this and get some pretty good information about it. But I'm still unclear about where planks form muscles - which part of the abs and where else.
Also, I hear so much about crunches being ineffective. How are they not effective, when I've seen the effects of them in the past? I've done crunches on the exercise ball and it works. So, what's wrong?
Plus
Where do planks form muscles?
I watch a lot of youtube on this and get some pretty good information about it. But I'm still unclear about where planks form muscles - which part of the abs and where else.
Also, I hear so much about crunches being ineffective. How are they not effective, when I've seen the effects of them in the past? I've done crunches on the exercise ball and it works. So, what's wrong?