12 Minute Core Workout. We asked Greatist Expert and CrossFit coach Erica Giovinazzo to put together a quick workout to challenge your entire core. Keep track of how many reps you can do—as your core gets stronger, youll increase the amount of reps.

12 Minute Core Workout. We asked Greatist Expert and CrossFit coach Erica Giovinazzo to put together a quick workout to challenge your entire core. Keep track of how many reps you can do—as your core gets stronger, youll increase the amount of reps.

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