Why Do They Call 'those Half Sit-Ups' ''Crunches''?

https://www.fitwirr.com/fitness/how-to-do-crunches
@mythociate (21437)
Oklahoma City, Oklahoma
January 9, 2022 11:43am CST
Bing Rewards led me to a page about https://www.masterclass.com/articles/crunches-exercise-guide#what-are-crunches 'doing more crunches,' and I wondered why people gave that name to the exercise? When I looked up the root of the word, the closest thing I found (when I saw that the word's actual root is 'the noise made when you chew crunchy food) is 'the fact that health-nuts are described as "crunchy" (due to their love of wholesome Crunchy Granola-bars).' Do you know of any other reason those half sit-ups are called "crunches"?
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