TRY THESE 4 PLANK VARIATIONS FOR YOUR DREAM ABS!

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via BlackDoctor:

Here is a video demonstration of different variations of planks. Planks are a great core exercise. They activate more muscles, improve one’s posture, and increase flexibility. Planks are sometimes safer than crunches because crunches can be harder on the back depending on the person. Planks can be easily modified as well.

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