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It's not planks or sit-ups — the starburst plank is torture on your abs, obliques and shoulders (so I tried it, and here's my verdict)

I don’t mind planks, but one of my problems with a standard plank is that the obliques don’t get hit hard enough for my liking. This side plank alternative is torture on your obliques, shoulders, and ...

I'm a personal trainer — these are the 5 best exercises you can do for your corset muscle, and no, none of them are sit-ups

Here are 5 exercises that target your 'corset muscle' ...
ABC News

62-year-old man breaks world record with 8-hour plank

George Hood completed around 1,500 sit-ups per day to train for the feat. An Illinois man who spent the past several months training seven hours a day, including 1,500 sit-ups daily, has broken the ...