Core Breakdown: How to Do a Double Crunch

Our abdominals go all the way to the pubic bone, but so often we only work to strengthen them from the belly button up, which can leave our lower backs vulnerable. Learn to activate the oft-neglected lower portion of your transverse (deep) and rectus (more superficial) abdominis muscles with Jeanne's double crunch, and see if you don’t enjoy the results of your efforts!

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