When exercising the muscles in one's back, it is important, in order to maintain a healthy back, to exercise the musc...

Nakia on September 15 at 07:14PM

Generally healthy back

Are you saying that a generally healthy back is not a sufficient condition? If so, then I am not understanding the premise. Please break down the premise.

1 Reply

on November 22 at 08:49AM

I am also having trouble understanding the video explanation for this question, how would it be diagrammed?