Quote:
Originally Posted by Valancy
Second- question: I'm still occasionally feeling twinges in my lower back during this. Is this likely to be caused by my weak abdominal muscles?
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Are you maintaining a flat back? If you are arching your back, that might cause a twinge.
I'd switch to a plank for a while, til you get stronger there, then move the plank onto the ball for a while before pushing it in and out.