text: how many calories do crunches burn? do you know? i do 200 crunches with 20 lbs of resistance a day. if hott in pink is right, it doesn't seem worth it!  i think crunches are more for building muscle than burning calories or fat.  try ddr max - it has a workout mode that estimates how many calories you've burned. i tried it once and i burned up about 500 in half an hour.  by the way - i'm no authority on the subject of diet and/or excersize...