Nothing is gained from doing an exercise with out full range of motion. The only thing that you are doing is stunting your performance. Doing crunches (while they burn like hell) don't really improve your abdominal performance. Try knees to elbows instead, or even better, hanging toes to fingers.
I think it is hilarious when people do curls (a useless exercise) and they do 21's. The first seven are only done half way up, then 7 are done from the top to half way, then 7 are done full range. If you have ever just done 21 straight curls, full range, its just as difficult. There is NO point in the isolation of one of the bicep muscles. You will never use just one of them.

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