I can't stand Imogen Thomas, but I don't think the strong stomach muscles was a lie.
I was told the same thing whilst pregnant, so whether she is lying or not, it is far from rubbish.
The lady who ran my NCT group said she encountered a ballet dancer whom had such tight stomach muscles that she would never be able to give birth normally so she ended up having a C-section. She also said 'fight tooth and nail against induction' I was induced because I had diabetes - baby was not ready to come out and I ended up having an epideral and a C-section. It wasn't what I wanted but at the end of the day my daughter is now fine which is what happened.