A comparative study looked at Ab Coaster, Ab Straps, Ab Lounge, Ab Circle Pro, Ab Roller, Perfect Sit-up, Ab Rocket, Ab Wheel, stability ball crunch, bicycle crunch, yoga boat pose, side plank, front plank, decline bench curl-up, captain's chair crunch, and the traditional crunch to determine which ones activated your six pack muscle the best. The result was that except for The Ab Wheel, side plank, Ab Circle Pro, and front plank, all others showed better activation of your six-pack muscle. Despite what you read the traditional crunch activates your six-pack muscle as well as any of the exercises listed, and is better than planks and the Ab Wheel. Here is the research! https://minds.wisconsin.edu/handle/1793/67303
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