Stuart McGill, a professor of spine biomechanics at the University of Waterloo in Canada, demonstrates a core exercise program that emphasizes all the major muscles that support the spine and prevent injury!
Planks, bird dogs, side planks, TRX planks with pike, etc, are where it's at for strengthening core/abs and avoiding spinal issues and or making pre existing issues worse.. I have not done a crunch in many moons myself.
http://www.youtube.com/watch?v=kukmaW9CmSU


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