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In this video, I will show you how to perform double crunches correctly. This is one of the best crunch variations you'll ever do because it has a wide range of motion. 
Double crunches will work your upper and lower abs. 
Double crunches benefits include a stronger core, six pack abs, and fat loss. 
Add double crunches to your ab workout if you want to activate your double crunches. 
That's how you do double crunches correctly.