Now that we're almost two weeks into our plank challenge, you've probably figured out that some kinds of planks feel harder than others. Tiny changes in your body's position can make a big difference.
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Video: The plank is a great exercise for your core, but holding it like a statue is only one of many ways to work those muscles. This video shows a plank-based exercise you probably haven't seen before -- and it's great for your obliques.
We've told you how to do planks, and why to do planks, and what to do instead of planks when you get bored of planks. But there's a critical thing about planks we forgot to tell you: You don't have to hold the position until you collapse.