Ab Machines at Planet Fitness: The Complete Guide

Quick Answer

Every Ab & Core Machine at Planet Fitness

Here’s the full lineup you can expect to find, though the exact mix depends on your specific club:

Beyond these dedicated machines, plenty of members also work their core using a medicine ball for rotational throws, or the cable towers for cable crunches and woodchoppers — both are covered in more detail in the full Planet Fitness machines guide.

Abdominal Crunch Machine

This is the most straightforward ab machine on the floor and a good starting point if you’re new to core training.

1. Adjust the seat so the chest pad or handles sit at a comfortable height, and select a light-to-moderate weight on the stack.
2. Sit tall with your core engaged before starting the first rep.
3. Crunch forward slowly, leading with your abs rather than pulling with your arms or shoulders.
4. Pause briefly at the point of full contraction, then return under control rather than letting the weight snap back.

Torso Rotation Machine

This one is specifically built for your obliques, the muscles along the sides of your core that a straightforward crunch doesn’t hit as directly.

1. Sit with your hips and legs stabilized in the seat, keeping your lower body still throughout the movement.
2. Rotate your torso to one side under control, driven by your obliques rather than momentum.
3. Return to center slowly, then repeat for the set before switching direction.
4. Keep the weight moderate — this is a rotational movement, and using too much resistance tends to reduce range of motion rather than build strength safely.

Captain’s Chair

The Captain’s Chair is a bodyweight station rather than a weighted machine, and it’s one of the more effective lower-ab exercises available on a standard gym floor.

1. Position your forearms on the padded arm rests and your back flat against the support pad.
2. Let your legs hang straight to start, with your core braced rather than swinging.
3. Raise your knees toward your chest, focusing on curling your pelvis up rather than just lifting your legs with your hip flexors.
4. Lower slowly instead of dropping back down, keeping tension on your abs through the full rep.

Decline Bench

The decline bench is simple but versatile — it’s mainly used for crunches and sit-ups, with the downward angle adding extra resistance compared to doing the same movement on flat ground.

1. Hook your feet under the padded rollers and lie back on the bench.
2. Cross your arms over your chest or lightly support your head with your hands, without pulling on your neck.
3. Curl your torso up using your abs, rather than yanking with your neck or arms.
4. Lower with control instead of letting gravity do the work on the way down.
5. Hold a light weight plate across your chest once bodyweight reps start feeling easy, to keep progressing.

Where Abs Fit Into the 30-Minute Circuit

Planet Fitness’s signature 30-Minute Express Circuit alternates strength stations with cardio steps, and core work is often folded in as one of the strength stations rather than treated as a separate add-on. If your club’s circuit includes an ab or core station, it’s a good way to make sure your core gets consistent attention even on days you’re short on time.

Common Mistakes on Ab Machines

• Going too fast. Rapid, bouncy reps rely on momentum instead of muscle contraction — slowing down is the single biggest upgrade you can make on any of these machines.
• Pulling with your neck or arms on the crunch machine or decline bench instead of leading the movement with your abs.
• Swinging on the Captain’s Chair rather than controlling the raise and lowering it slowly.
• Overloading the torso rotation machine, which shortens your range of motion and shifts stress away from the obliques.
• Skipping core work entirely because it feels less “important” than bigger lifts — a strong core supports nearly every other exercise you do, including squats on the Smith machine and pressing movements.

A Simple Beginner Ab Circuit

If you’re not sure how to put these machines together, this basic rotation covers your whole core in one short circuit:

Rest about 30–45 seconds between sets, and prioritize slow, controlled reps over rushing through the circuit — core training responds far better to quality than volume.

Frequently Asked Questions