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![]() ![]() And what is a sit-up but a back bend done in a lying position? "When people are doing curl up over gym balls and sit-ups, and this kind of thing, they are replicating a very potent injury mechanism on their back," says McGill. Think of the oft-repeated advice for movers: bend at the hips and lift with your legs, not your back. Inside each disk is a mucus-like nucleus, he says, and "if you keep flexing your spine and bending the disk over and over again, that nucleus slowly breaches the layers and causes a disk bulge, or a disk herniation." A herniated disk won't show through your swimsuit, but it's no fun, and can cause persistent back and leg pain, weakness, and tingling. McGill, a professor of spine biomechanics at the University of Waterloo. "There are only so many bends or a 'fatigue life'," in your spinal disks," says Stuart M. ![]() The section with the most nerves (and most potential for nerve damage) is in the back of the spine, which is the very part that bends and strains during a sit-up. ![]() That's because the "full flex" movement-the actual "crunch" part of crunches – puts an unhealthy strain on your back at its weakest point. Richard Guyer, president of the Texas Back Institute. "We stopped teaching people to do crunches a long, long time ago," says Dr. Or is it?Īs it turns out, the exercises synonymous with strong, attractive abs may not be the best way to train your core-and may be doing damage to your back. Lots and lots and lots of excruciating crunches. ![]() Everyone knows that the road to flat, tight abs is paved with crunches. ![]()
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