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DAREBEE Workout: What it Works
Tough workouts don't just push you aerobically, they also test your cardiovascular system by mixing floor and standing exercises in quick succession and challenging your body's ability to maintain effective blood flow to the muscles. You understand then why Tough As Nails is as difficult as it is. At difficulty Level IV it delivers quite a burn when you add EC.  
Extra Credit: 1 minute rest between sets. 
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