5 best crunches to work your core

5 best crunches to work your core

Doing crunch after crunch in the hopes of a flat stomach can get boring, quickly.

Just a few minutes of each of these variations of the standard ab crunch will work new muscles so you get tight abs, and a strong core. It will also improve your posture and overall running. 

If you want to take your ab and core training up a notch, take on our 30 day ab challenge and 30 day core challenge:

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