The phrase "crunch machine" typically refers to a piece of exercise equipment that helps people strengthen their abdominal muscles by doing crunches or sit-ups. Full definition
If you have the mentioned problems, this ab crunch machine is a great solution for you. (abmachinesguide.com)
And the seated crunch machine does allows lifters to pile on weight that seems to be effective at working the core. (dailyburn.com)
Jack Dongarra, a computer scientist at the University of Tennessee, has been tracking the progress of the world's best number - crunching machines since 1993. (discovermagazine.com)