ExercisesMachine crunch

Machine crunch

Sit on the ab machine with the pad against your chest. Crunch forward by shortening the distance from ribs to hips, then return slowly without letting the weight yank you back.

CoreMachinesDifficulty 1 of 3
Two-panel demonstration of the machine crunch, showing the start and finish positions
Start and finish positions

How to do it

Sit on the ab machine with the pad against your chest. Crunch forward by shortening the distance from ribs to hips, then return slowly without letting the weight yank you back.

Muscles worked

Front
Back
  • coreprimary

Hover a muscle to find it on the figure. Dark green is the primary mover, lighter green is supporting work.

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How many sets should you do?

That depends on your goal, your ability, and how many days you train. Answer three questions and the builder works out your sets and reps, plus a full week around them.

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JM
Johnny Milaychev · Product manager and self-directed lifter, not a trainer or a clinician. Why that matters and where this guidance stops.
Reviewed 16 August 2026 · Exercise library v2.2