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marien's version of bicycle crunch (to failure)

How many can you do? Lie on your back and place your fingertips behind your ears. You want to raise your legs off the floor and keep them up. Engage your abs and make sure to keep your lower back flat against the floor. Raise your shoulders off the floor and keep them off the floor. Now alternate opposite shoulder to opposite knee until you can no longer continue(to failure)*edit* each pair of crunches counts as one rep.  more about this challenge...

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