"I'm probably the least flexible athlete you'll find. When it comes to yoga, I can't get in the positions and I can't hold them. You have to be pretty flexible to do it. Once you get certain positions, you have to have the core strength to hold those positions. It's a pretty good workout."

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I am of the opinion that anyone who can squat 400 lb below parallel without a suit or press200 overhead has a strong core. I am of the opinion that when a person increases their squat, theyhave increased their core strength. I am also of the opinion that if a person wants to strengthentheir core, they must make something quantifiably stronger.

— Mark Rippetoe