If you’re working on “six-pack abs”, you may want to rethink your workout.

From the New York Times Magazine, Stuart McGill, a professor of spine biomechanics at the University of Waterloo in Canada, demonstrates a few core exercises that emphasize all the major muscles that support the spine.

“I see too many people,” McGill told me with a sigh, “who have six-pack abs and a ruined back.”

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