As shown in the video below, Reverse Crunches use the transverse abdominus, the deepest muscle in your abs. The Jennifer Garner workout uses Reverse Crunches, followed by regular crunches, bicycle crunches, side planks, and forearm planks. The Rock workout uses Double Crunches, Bicycle Crunches, and then Reverse Crunches to finish his abs routine.
You can learn more about Reverse Crunches by reading Five Factor Fitness by Harley Pasternack. This allows your upper abs to recover from the workout you did on Monday, and your obliques from the yesterday.
He always does his ab workouts at the beginning of his routine, to clear his head, and focus on his abs.
They are called Reverse Crunches because you are doing the opposite of the normal crunch, or Upper Body Crunches.
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