Full Body Workouts For Mass :

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This 30-day challenge is designed to help you progress the amount of time you are able to hold a plank by, yes, holding a standard plank—but also by using other plank-based moves. Switching things up will not only help keep you from getting bored, but it will help you unlock the power in your core. Plus, the circuits will raise your heart rate, get you sweating, and light those abs on fire! #planks #plankchallenge #strengthtraining

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