Ab Crunch Machine
A seated machine core exercise that uses a fixed resistance to crunch the torso down while the legs lift, isolating the abs without any spinal loading from free weights. It suits lifters wanting a controlled way to train the core.
How to do the ab crunch machine
- Sit in the machine, choose a light resistance, and place your feet under the leg pads.
- Grip the top handles with your arms bent at a right angle, resting your triceps on the pads.
- Crunch your torso forward while lifting your legs at the same time, exhaling as you move.
- Pause briefly once your abs are fully contracted, keeping the movement slow rather than jerky.
- Return to the starting position under control as you inhale, letting the core stretch slightly.
Original library instructions (4 steps)
- Select a light resistance and sit down on the ab machine placing your feet under the pads provided and grabbing the top handles. Your arms should be bent at a 90 degree angle as you rest the triceps on the pads provided. This will be your starting position.
- At the same time, begin to lift the legs up as you crunch your upper torso. Breathe out as you perform this movement. Tip: Be sure to use a slow and controlled motion. Concentrate on using your abs to move the weight while relaxing your legs and feet.
- After a second pause, slowly return to the starting position as you breathe in.
- Repeat the movement for the prescribed amount of repetitions.
Common mistakes
- Loading too much resistance early on, which forces the legs and arms to take over from the abs.
- Rushing the return phase and letting the weight stack drop; lower it under control instead.
- Pulling with the arms rather than crunching with the torso, which shifts work away from the core.
Sets and reps by goal
| Goal | Sets, reps and rest |
|---|---|
| Strength | 3 sets of 8 to 10 reps, 60 to 90 seconds rest |
| Muscle | 3 to 4 sets of 10 to 12 reps, 45 to 60 seconds rest |
| Endurance | 2 to 3 sets of 15 to 20 reps, 30 seconds rest |
Ranges, not prescriptions. Start at the low end and add a set or a rep when every set feels controlled.
Tips
- Start with a lighter resistance than you think you need, since the machine makes it easy to cheat with your arms.
- Keep your neck relaxed and let your eyes look slightly down rather than straining upward.
In the app: this exercise is one of 873 in GymPilot's library, with the same photos, form cues and a link back to the moment in an imported video it came from.
Questions
Is the ab crunch machine good for beginners?
It works well for beginners and intermediates alike since the machine guides the movement and lets you dial in the resistance, though learning to isolate the abs rather than pulling with the arms takes some practice.
What muscles does the ab crunch machine work?
It targets the core, mainly the abdominal muscles that flex the spine, since this record does not list any secondary muscles for the exercise.
