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I'm kinda with Charles Poliquin and co on this one -
http://www.poliquingroup.com/Tips/tabid/130/EntryId/917/Tip-264-Perform-Squats-and-Olympic-Lifts-for-Greater-Core-Strength-and-Power.aspx
People involved in a decent lifting programme are probably getting enough in fact if you ask most bodybuilders they rarely train them .
If you want to do some specific ab work or you feel it's necessary my favourites are
Medicine ball sit up throw with or without a partner
Cable crunches with a rope
Ab roller
Some form of knee raises ,my favourite are off a bench .
Farmers walks .
Back to basics:
Which 'method' for plank do you use? Post links to online articles if you like.
I've spent the last year and a half trying to perfect what my favourite yoga teacher told me. But I've been bothered that I never got the breathing right and that this was undermining what I could achieve.
Having had a rummage around online I find plenty of conflicting advice. This diversity of opinion has me a bit excited though. There seems to be room for fashioning a method that works for you.