Decline Sit-Up
- Beginner
- Bodyweight
The decline sit-up is performed head-down on an angled bench with the feet locked under a padded roller. Unlike a crunch, the torso travels all the way up until the chest approaches the thighs, so the movement combines trunk flexion from the abdominals with hip flexion driven by the hip flexors and rectus femoris. The decline angle adds resistance at the bottom of the range where the abdominals are longest, and steeper settings make the exercise harder without any added weight. Tucking the chin protects the neck through the top of the rep.
How to do the Decline Sit-Up
- Set a decline bench and secure both feet under the padded roller.
- Lie back with your knees bent and your arms crossed over your chest.
- Tuck your chin lightly toward your chest to protect the neck.
- Exhale and curl your torso up until your chest travels toward your thighs.
- Pause briefly at the top with the abdominals fully shortened.
- Lower yourself back to the bench under control and repeat.
Muscles worked
- Primary:
- Core
- Secondary:
- Quads
Why train it
- Trains the full trunk flexion range with more resistance than a floor sit-up.
- Adjusts difficulty by bench angle, so one station serves several ability levels.
- Loads easily with a plate or dumbbell held across the chest when bodyweight stops challenging.
Common mistakes
- Yanking on the head or neck to start the rep, which strains the cervical spine.
- Letting the hip flexors pull the torso up first, which leaves the abdominals barely loaded.
- Dropping back onto the bench at speed, which discards the eccentric and jars the spine.
- Choosing a steep decline before the movement is controlled, which forces momentum-driven reps.
Frequently asked questions
What muscles does the Decline Sit-Up work?
The Decline Sit-Up trains the core as the main target. Expect the quads to take some of the load as well.
What equipment do I need for the Decline Sit-Up?
None. The Decline Sit-Up is a bodyweight movement, so your own weight is the resistance and floor space is the only requirement.
Is the Decline Sit-Up suitable for beginners?
Yes. The Decline Sit-Up is rated beginner: you are the load, so there is no weight to get wrong. Add reps or time only once the position holds from the first of them to the last.
Can I do the Decline Sit-Up at home?
Yes, anywhere. There is nothing to buy and nothing to set up, which makes the Decline Sit-Up one of the movements worth keeping for days you never reach a gym.
How many sets and reps of the Decline Sit-Up should I do?
Three sets of 12 to 20 reps, or 30 to 60 seconds for anything you hold. Add load or leverage once the top end feels easy rather than piling on more reps.
What are good alternatives to the Decline Sit-Up?
Cable Side Bend, Dumbbell Side Bend, and Machine Crunch train the same primary muscles as the Decline Sit-Up. Pick whichever one matches the equipment in front of you.