Machine Seated Crunch
- Secondary muscles
- Obliques
- Body part
- Core
- Position
- Seated
- Laterality
- Bilateral (both sides together)
- Category
- Strength
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Sitting against a pad with a weight stack behind you turns the crunch into a loadable, repeatable lift you can progress week to week like any other machine movement. Compared with the chest-pad version, pulling on handles brings your arms into play, so check that the rep stays a rib-cage curl rather than an arm pull.
How to do the Machine Seated Crunch
- Sit on the leverage machine with your back against the pad and your feet flat on the floor.
- Grasp the handles or place your hands on the side pads for support.
- Engage your abs and slowly lean back, allowing the pad to move with you.
- Once your upper body is at a 45-degree angle, contract your abs and crunch forward, bringing your chest towards your knees.
- Pause for a moment at the top, then slowly release and return to the starting position.
- Repeat for the desired number of repetitions.
Tip: Exhale slowly as you roll out and keep the ribs pulled down toward the pelvis the entire time.
Muscles worked
Primary
Abs · Core
The abs work almost entirely to resist extension, holding the pelvis tucked as the lever gets longer; the tension should be highest at the far point of the rollout, not on the way back.
Secondary
- Obliques
Common mistakes
- Hips sagging at the bottom — if your lower back arches as the wheel rolls out, you have gone past the range your abs can control; shorten the rollout and stop at the point where your hips still stay tucked.
- Hinging at the hips — pushing your backside back toward your heels on the return turns it into a hip hinge; keep the hips locked in line with the torso and pull with the abs.
- Reaching with the arms — leading with the arms turns it into a lat exercise; think of moving the whole body as one rigid plank that happens to lengthen.
- Skipping the posterior tilt — before you roll, squeeze the glutes and tuck the pelvis slightly so the abs are braced before the load arrives.
Sets, reps and where it fits
| Goal | Sets × reps | Rest |
|---|---|---|
| Strength | 3 × 8–12 | 60 s |
| Endurance | 2–3 × 15–25 | 45 s |
Rollouts belong toward the end of a session, after heavy lifts but while you can still brace well. Superset them with hanging knee raises or a plank variation so the core work is done in one block.
Variations and alternatives
Similar exercises
Frequently asked questions
What muscles does the Machine Seated Crunch work?
The Machine Seated Crunch primarily works the abs. It also involves the obliques, which assist the movement and stabilise the joints.
Is the Machine Seated Crunch good for beginners?
Yes. The Machine Seated Crunch is rated beginner: it uses a machine and the movement is simple to learn. Start light, focus on the full range of motion and add load once every rep looks the same.
What can I do instead of the Machine Seated Crunch?
If you cannot do the Machine Seated Crunch, try the Chest Pad Machine Seated Crunch, the Machine Kneeling Torso Rotation or the Dead Bug. Each of them trains the abs through a similar movement, so you can swap them in without changing the rest of the workout.
How many sets and reps should I do?
It depends on your goal. For the Machine Seated Crunch, a sensible starting point is strength: 3 × 8–12 with 60 s rest; endurance: 2–3 × 15–25 with 45 s rest. Train it at the end of a session or pair it with a lower-body lift as active rest.
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Exercise data and animations are licensed ExerciseDB content used in SetGrip. This page is for general information and is not medical or coaching advice.