Weighted Sit-Up
The sit-up carries you through a larger range than a crunch, calling on the whole rectus abdominals plus the hip flexors, and a plate makes it a genuine strength exercise. It builds trunk flexion strength that transfers to getting up off the floor and to sport. Keep the tempo honest so momentum does not do the work the abs should.
- Equipment
- Plate
- Body part
- Abs
- Type
- Strength
- Browse by muscle
- Upper Rectus Abdominals, Lower Rectus Abdominals
- Browse by movement
- Spinal Flexion
- Target
- Upper Rectus Abdominals, Lower Rectus Abdominals
- Secondary
- Rectus Femoris, Abdominal External Oblique
How to do it
- 1
Lie back with knees bent and feet anchored or flat on the floor.
- 2
Hold a plate against your chest with both hands.
- 3
Brace the abs and curl up, peeling the spine off the floor one segment at a time.
- 4
Sit up until your torso is upright over the hips.
- 5
Reverse the motion, lowering the spine down slowly and segment by segment.
- 6
Exhale as you rise and keep the plate snug to the chest.
Tips
- Roll up through the spine rather than hinging stiffly from the hips.
- Avoid throwing the plate forward for momentum at the bottom.
- Keep the neck neutral; do not tuck the chin hard into the chest.
- If the lower back complains, shorten the range or return to weighted crunches.
Variations
Common mistakes
- The plate is pushed out to arm's length over the chest because it feels lighter there, and the shoulders end up doing an unplanned front raise for the whole set.
- Load climbs before the range does, so the top of the rep quietly slips from an upright torso back to a half-finished crunch.
- The plate rests up on the collarbones where it presses against the throat at the top; hold it flat over the sternum with both hands cupping the edges.
- Feet start lifting off the floor as the plate gets heavier, which is a signal to take weight off rather than to find a heavier anchor.
- A plate held only by its rim slips as the hands sweat, and a dropped plate at the top of a sit-up lands on your face; grip the handles or hug it flat to the chest.
- The lower back arches off the floor before the first rep because the plate is pulling the torso backward; press the ribs down and set the spine before you start.
Frequently asked
- How many weighted sit-ups should you do?
- Four sets of 8 to 12 reps holding a plate of 5 to 10 kg, resting 90 seconds, twice a week. Move up 2.5 kg once all your sets reach twelve reps with the torso still coming fully upright. If you cannot get eight, the plate is too heavy for now. Two seconds up and two seconds down is the tempo worth keeping, because it is the one that stops the plate from swinging you through the sticking point.
- How do you do weighted sit-ups without a plate?
- A dumbbell held by one end, a kettlebell by the horns, or a medicine ball all load the same movement, though a plate is easiest to progress in small jumps. In a gym, a cable crunch or an ab machine loads trunk flexion with a pin rather than a plate and is gentler on the back for a lot of people. At home, a loaded backpack held to the chest works well and stays put better than anything you have to grip.
- Should you add weight to sit-ups or do more reps?
- Add weight. Once you are past twenty clean bodyweight reps you are training endurance, and a plate turns trunk flexion back into something you can load and track over months, working the rectus abdominis over a bigger range than a crunch reaches and bringing the hip flexors in at the top. That transfers to grappling and to getting off the floor under load. The exception is a back that dislikes repeated bending under weight, where reps are not the answer either: carries, rollouts, and rotational drills are.
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