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venturon said:Don't quote me on this, but a crunch is when you only go partway up a sit-up, so if you were to extend your fists forwards they'd be just a little past your knees. It's supposed to reduce back strain.
TheSomeone said:Not exactly.
A crunch is when you just lift up the top of your back from the floor, and you do them really fast. You'll see why it's called a crunch when you do them, because you're "crunching" your abs.
Although the description makes it sound easier, it isn't for several reasons: the bottom of the back never leaves the floor, which centralizes the workout to your abs (sit-ups use the hip flexors), you do them much faster, and you have no momentum whatsoever.