How many sets and reps of the Roman chair sit-up should you do when you are new to the exercise?

Two to three sets of 8 to 12 reps, resting 60 to 90 seconds between sets, is enough to start, stopping a couple of reps before your range or form breaks down. Once you can control 3 sets of 15 through the full arc without swinging, add a light plate to the chest instead of chasing more reps.

What can I do instead of the Roman chair sit-up if my gym has no Roman chair?

Hook your feet under a low bar, a loaded barbell, or a sturdy piece of furniture and do the same movement as a decline sit-up on the floor, or use a stability ball to get a similar stretch at the bottom. Either option reproduces the extended range that makes this exercise useful.

What is the Roman chair sit-up good for, and when should I skip it?

It builds a strong abdominal contraction through a longer range than a floor crunch allows, which suits lifters chasing ab hypertrophy or a harder core finisher. Skip it if you have ongoing low back pain or limited hip mobility, since the extended bottom position asks a lot of the lumbar spine and hip flexors.

Intermediate

Roman Chair Sit-Up

The Roman chair sit-up seats you on a padded frame with the feet hooked, letting the torso extend slightly below level before you curl back up. That extra range at the bottom lengthens the rectus abdominis and can build a strong flexion contraction through a longer arc. Keep the range honest, because dropping too far into extension shifts stress toward the hip flexors and low back.

Equipment: Machine
Body part: Abs
Type: Strength
Browse by muscle: Upper Rectus Abdominals, Lower Rectus Abdominals
Browse by movement: Spinal Flexion

How to do it

1
Sit on the Roman chair and hook your ankles under the foot pads.
2
Cross your arms on your chest and brace your abs.
3
Inhale and lower the torso back until it is roughly parallel to the floor.
4
Exhale and curl up by rounding the spine toward the thighs.
5
Squeeze the abs hard at the top of the sit-up.
6
Control the next descent rather than falling back.

Tips

Lead with the ribs curling toward the pelvis instead of yanking from the neck.
Do not hyperextend far below parallel; stop where you keep tension on the abs.
Hold a plate on the chest once bodyweight reps become easy.

Variations

Common mistakes

The hips rock forward to start the sit-up before the spine curls, turning the rep into a hip-flexor swing instead of an abdominal crunch.
Feet press hard into the pads to launch the torso upward, a leg drive that steals work the abs should be doing.
Once fatigue sets in, the descent turns into a fast drop rather than a controlled lower, jarring the low back at the bottom of the range.
The ankles sit only loosely under the pad, so the hips slide and rock instead of staying anchored through the rep.
Craning the neck forward to close the last few inches strains the cervical spine and adds nothing to the rectus abdominis contraction.

Frequently asked

How many sets and reps of the Roman chair sit-up should you do when you are new to the exercise?: Two to three sets of 8 to 12 reps, resting 60 to 90 seconds between sets, is enough to start, stopping a couple of reps before your range or form breaks down. Once you can control 3 sets of 15 through the full arc without swinging, add a light plate to the chest instead of chasing more reps.
What can I do instead of the Roman chair sit-up if my gym has no Roman chair?: Hook your feet under a low bar, a loaded barbell, or a sturdy piece of furniture and do the same movement as a decline sit-up on the floor, or use a stability ball to get a similar stretch at the bottom. Either option reproduces the extended range that makes this exercise useful.
What is the Roman chair sit-up good for, and when should I skip it?: It builds a strong abdominal contraction through a longer range than a floor crunch allows, which suits lifters chasing ab hypertrophy or a harder core finisher. Skip it if you have ongoing low back pain or limited hip mobility, since the extended bottom position asks a lot of the lumbar spine and hip flexors.

Related exercises

Other movements among FitRay's 2,000+ exercises that load the same target muscle — same equipment and level first.

All Abs exercises