Arms Crossed Sit-Up
In SetGrip: Sit-Up (Arms Crossed)
- Primary muscleAbs
- EquipmentBodyweight
- DifficultyBeginner
- TypeCore · Core flexion
- Secondary muscles
- Hip Flexors
- Body part
- Core
- Position
- Lying
- Laterality
- Bilateral (both sides together)
- Category
- Strength
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Crossing your arms over your chest shortens the lever just enough to make this the middle difficulty setting for sit-ups: harder than reaching the hands forward, easier than clasping them behind your head. It also removes the temptation to yank on your neck, which is why many coaches teach the sit-up this way first.
How to do the Arms Crossed Sit-Up
- Lie flat on your back with your knees bent and feet flat on the ground.
- Cross your arms over your chest.
- Engaging your abs, lift your upper body off the ground towards your knees.
- 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: Reach the hands forward along the thighs and think of peeling the spine off the floor from the top down.
Muscles worked
Primary
Abs · Core
The abs curl the torso off the floor and then control it back down, and they do the most work in the first 30 degrees of the movement before the hip flexors take over.
Secondary
- Hip Flexors — The hip flexors pull you the rest of the way up once the abs have curled the ribs, and they will dominate if the feet are anchored and the range is rushed.
Common mistakes
- Yanking the neck — hands behind the head should support only; keep the elbows wide or cross the arms on the chest.
- Jerking up flat-backed — the spine should curl up one segment at a time starting from the head, not lift as a rigid board.
- Dropping back down — the lowering half is where the abs work hardest, so take two or three seconds to come down.
- Anchoring the feet — this lets the hip flexors do everything; if you must anchor, keep the knees bent and focus on curling the torso.
Sets, reps and where it fits
| Goal | Sets × reps | Rest |
|---|---|---|
| Strength | 3 × 8–12 | 60 s |
| Endurance | 2–3 × 15–25 | 45 s |
Sit-ups go at the end of a session with the other core work. Superset them with a back extension to balance the front and back of the trunk.
Variations and alternatives
Similar exercises
Without bodyweight
Frequently asked questions
What muscles does the Arms Crossed Sit-Up work?
The Arms Crossed Sit-Up primarily works the abs. It also involves the hip flexors, which assist the movement and stabilise the joints.
Is the Arms Crossed Sit-Up good for beginners?
Yes. The Arms Crossed Sit-Up is rated beginner: it uses no equipment beyond your bodyweight and the movement is simple to learn. Start light, focus on the full range of motion and add load once every rep looks the same.
What can I do instead of the Arms Crossed Sit-Up?
If you cannot do the Arms Crossed Sit-Up, try the Partner Assisted Sit-Up, the Sit-Up or the Straight Leg Sit-Up. 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 Arms Crossed Sit-Up, 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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