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Upside-down Crunch

The Upside-down Crunch works your abs.

-The Booty Camp Workout: Upside-Down Crunch. This move is very subtle. You're gonna arch your back slightly then tuck your pelvis under the crunch. Imagine as if you were doing crunches on the flip side. Try to hold the tuck for 5 counts. You'll do 8 to 10 reps.