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In the New York Times today, Gretchen Reynolds writes about core training myths and the potential dangers of performing sit-ups and crunches: these can be very hard on your spine. Want to know what you should do instead? Watch this helpful video, narrated by Stuart McGill, a professor of spine biomechanics at University of Waterloo in Canada. Side bridges, planks and work on a resistance ball can help protect your spine and build those vital core muscles runners need.