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"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Please see responses from Life Time Plymouth (Minnesota) Personal Trainer Keri Anderson Thanks a bunch! 1 ...

Think of the ab crunch machine as the opposite of the back extension machine. While the back extension machine targets your lower back and core by bending backward, the ab crunch machine targets the ...

This exercise only targets the abdominal muscles, so it’s not a functional core workout. Crunches can be hard on your back and neck, and may not be safe for everyone. Share on Pinterest The crunch is ...