Guess this might make the whole process easier
Cable kneeling crunch (exrx.net)
I knew there was no way this had not been done before ... I like my name better though
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I have recently discovered what I call a weighted reverse
cable crunch (doubt I am the first to try it ... but since I thought of it before I read any other name it already might have had I named it

)
Basically get on your
cable rows machine (or any pulldown that will go low enough), kneel, grasp your handle (I find palms out, elbows tight to my ears or above my head is good) and curl your chest toward your knees (make sure to curl your back as well, otherwise it's the lower back dong most of the work).
make sense ??
can put more thought into a description if you want.
Am looking up Exrx.net now to see if they have a gif of the sort of thing I mean.
Great exercise for adding weight to a crunch motion (absolutely kills the abs but takes a fair bit of weight).
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