Crunches challenge

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There are 4 layers of abdominal muscles, but it’s the top layer that gives the trained, 6 pack look. These are the muscles that are worked by crunches. Basically an abdominal crunch involves bringing your upper body and lower body closer together in some way. In this ab crunch challenge, there are 3 variations – the standard crunch, reverse crunch and bicycle crunch | printable fitness challenge at

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