DAREBEE Workout: What it Works
No sets - just one killer circuit. Core Builder uses the body's own inertia to target each of the four muscle groups that make up the abdominals. The result is a workout that never feels easy but which gives you what is arguably the perfect exercise when it comes to building stronger abs and core. Perform after a workout or whenever you feel you could do with a good abs workout.
Extra Credit: Keep legs up throughout. 

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