What methods have you usedto teach clients that core stability (endurance) must be mastered prior to developing core strength? Often clients request to do abdominal exercises they have read about and or viewed in the gym. It “looks more fun” than the “draw in” type. How do you keep them happy and safe?
I looked at you profile and noticed that you are ACE Certified. I am as well.
I am a big fan of ACE’s IFT Model. I find it to be very effective. One of the things that I am impressed about is that ACE references individuals who are on top of their game as far as core stability is concerned. Folks like, Shirely Sahrmann, Paul Hodges, McGill, etc.
However, to answer your question, I would really recommend that you look at chapter nine of the the ACE Personal Trainer Manual.
There you will find a wealth of information that will do better justice than me just spitting out some exercises. I sure hope you have the fourth edition of the manual.
I hope this of help to you.