Decline Crunch
Also known as: decline crunches, decline bench crunch, decline bench crunches, decline ab crunch, crunches on decline bench
- Primary muscleAbs
- EquipmentBodyweight
- DifficultyIntermediate
- TypeCore · Core flexion
- Secondary muscles
- Hip Flexors
- Body part
- Core
- Position
- Lying
- Laterality
- Bilateral (both sides together)
- Category
- Strength
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Setting the bench to a decline puts your torso below your knees, so the abs work against gravity through a longer arc than they get on the floor, and the foot pads let you pull harder without sliding. Steeper angles raise the difficulty in small steps, which makes progression measurable before you ever add a plate.
How to do the Decline Crunch
- Lie on a decline bench with your feet secured and your knees bent at a 90-degree angle.
- Place your hands behind your head or across your chest.
- Engage your abs and lift your upper body towards your knees, curling your torso.
- Pause for a moment at the top, then slowly lower your upper body back down to the starting position.
- Repeat for the desired number of repetitions.
Tip: Breathe out as you crunch and let the last bit of air leave the lungs at the top of each rep.
Muscles worked
Primary
Abs · Core
The rectus abdominis shortens to bend the spine forward, and each rep should end with the upper abs fully contracted and the ribs pulled down.
Secondary
- Hip Flexors — The hip flexors take over if your feet are anchored and you come up too high; keep the range short to leave them out.
Common mistakes
- Pulling on the neck — hands behind the head should support, not yank; keep the elbows wide and the chin about a fist away from the chest.
- Sitting all the way up — a crunch is a curl of the ribs toward the pelvis, not a sit-up; the lower back should stay on the floor the whole time.
- Cranking out fast reps — momentum does the work if you bounce; lift to a squeeze, hold for a count and lower slowly.
- Never adding load — once bodyweight reps get easy, hold a plate on the chest or use a cable rather than doing sets of 50.
Sets, reps and where it fits
| Goal | Sets × reps | Rest |
|---|---|---|
| Strength | 3 × 8–12 | 60 s |
| Endurance | 2–3 × 15–25 | 45 s |
Crunches close out a session after the heavy work, or they can fill the rest periods between sets of a lift that does not need much bracing. Pair a cable crunch with a cable side bend on the same stack.
Variations and alternatives
Similar exercises
Without bodyweight
Frequently asked questions
What muscles does the Decline Crunch work?
The Decline Crunch primarily works the abs. It also involves the hip flexors, which assist the movement and stabilise the joints.
Is the Decline Crunch good for beginners?
It is rated intermediate, so it suits people who already train regularly. Beginners can still do the Decline Crunch with light load and a spotter or coach watching the first few sessions; if it feels awkward, pick an easier variation from the alternatives below first.
What can I do instead of the Decline Crunch?
If you cannot do the Decline Crunch, try the Cable Reverse Crunch, the Cable Tuck Crunch or the Stability Ball Crunch. 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 Decline 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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