Decline Sit-up
- Target muscle
- Iliopsoas
- Synergist muscles
- Quadriceps, Tensor Fasciae Latae
- Equipment
- Body weight
- Body part
- Hips
- Type
- Strength
The decline sit-up is a body-weight exercise performed on a decline bench with your head lower than your hips and your feet anchored at the top. The decline angle increases hip-flexion demand, so it primarily trains the hip flexors (iliopsoas), with the quadriceps and tensor fasciae latae assisting while the abs work hard to stabilize the torso. It's a progression from the floor sit-up for building stronger, more loaded hip flexion.
How to do the Decline Sit-up
- 1Set the bench to a moderate decline and sit at the high end with your feet hooked securely under the foot pads or roller.
- 2Lower your back down the bench until your torso is roughly in line with it, keeping a slight bend in your knees.
- 3Cross your arms over your chest or place your fingertips lightly by your ears, and brace your core.
- 4Curl up by flexing at the hips, lifting your torso toward your knees in a smooth, controlled arc.
- 5Continue until your torso is upright or near vertical, exhaling as you rise.
- 6Pause briefly at the top without yanking on your neck or head.
- 7Lower yourself back down under control, inhaling as your torso returns toward the bench.
- 8Stop just short of fully relaxing at the bottom to keep tension, then repeat for your target reps.
Form tips
- Drive the movement from your hips and trunk, not by pulling your head forward with your hands.
- Control the lowering phase rather than dropping back, since the eccentric is where much of the work happens.
- Start with a shallow decline and increase the angle only once you can complete clean reps without straining.
- Keep your feet firmly anchored so the bench stays stable and your hip flexors can do the work safely.
- Add load by holding a light plate against your chest once body-weight reps become easy.
Common mistakes
- Pulling on your neck or head with your hands, which strains the cervical spine instead of working the hips.
- Using momentum to swing up, which removes tension from the target muscles and turns it into a cheat rep.
- Setting too steep a decline before you're ready, which can overload the lower back and hip flexors.
- Dropping back down quickly instead of lowering under control, wasting the eccentric and risking a jarred spine.
- Holding your breath throughout, which spikes intra-abdominal pressure and makes the set harder to control.
Frequently asked questions
What muscles does the decline sit-up work?
It primarily works the hip flexors (iliopsoas), with the quadriceps and tensor fasciae latae assisting. Your abdominals also work isometrically to stabilize the torso through each rep.
Does the decline sit-up work your abs?
The abs are involved, but mainly as stabilizers. The decline angle shifts much of the effort onto the hip flexors, so this is more of a hip-flexion exercise than a pure ab crunch.
Is the decline sit-up good for beginners?
Yes, if you start with a shallow decline. Begin on a flat or low-angle bench, master controlled reps, then increase the decline gradually as your hip flexors and core get stronger.
How many sets and reps should I do?
For most lifters, 3–4 sets of 10–20 controlled reps works well. Once body-weight reps feel easy, add a light plate to your chest rather than just chasing higher numbers.
Decline sit-up vs regular sit-up — what's the difference?
A regular sit-up is done flat on the floor, while the decline sit-up uses a bench with your head below your hips. The decline increases the range of motion and resistance, placing more demand on the hip flexors.
