Captain's Chair Leg Raise

Quick Intro

Captain’s Chair Leg Raise, also called the Roman Chair Leg Raise or Supported Hanging Leg Raise, is a machine-based strength training exercise performed with the back and forearms braced on a captain’s chair apparatus, raising straight legs toward the torso. Keeping the legs straight lengthens the lever arm, making this a much harder lower ab and hip flexor exercise than a bent-knee version.

Equipment Needed

A Captain’s Chair is required. No other equipment is needed.

Why It Matters

It takes body control to keep the legs straight and the torso still against a long lever, so this exercise trains coordination along with endurance in the abs. The main abdominal muscle running down the front of the torso (rectus abdominis) leads the raise, with support from the muscles that lift the thigh toward the torso (hip flexors, iliopsoas), the muscles along the sides of the waist (obliques) and a deep core muscle that wraps around the torso like a corset (transverse abdominis). Keeping the legs straight and controlling the lowering phase, without letting them drop, is what builds strength here.

When to Do It

Captain’s Chair Leg Raise works well as part of a core-focused session, either early while the core is fresh or as an advanced finisher after other ab work. A frequency of two or three sessions a week, spaced for full core recovery, suits most people.

Anyone with a current lower back or shoulder issue should get individual guidance before starting this exercise, since the hanging position and long lever arm load both areas.

Getting Ready

A short round of bodyweight crunches or a hollow body hold gets the core switched on before moving to the captain’s chair. A few reps at a reduced range or with bent knees previews how the demand feels before attempting a full straight-leg set.

Step-by-Step Instructions

1. The setup. Brace the back against the pad and rest the forearms on the arm supports, letting the legs hang straight.

2. The starting position. Straighten both legs and let them hang, keeping the core braced against the pad.

3. The raise. Raise the straight legs toward the torso, curling the pelvis under as they rise.

4. The lower. Lower the legs back down under control, resisting the pull of gravity the whole way.

How Many, How Often

Captain’s Chair Leg Raise is dosed by reps and sets, with progression coming from adding reps, slowing the tempo or extending the pause at the top before working toward a fuller range.

Level	Where you’re at	What to do
Beginner	New to a straight-leg supported raise	3 sets of 5 to 8 reps, allowing a slight knee bend if needed to control the descent
Intermediate	Comfortable completing reps with straight legs and no swinging	3 sets of 10 to 12 reps with fully straight legs
Advanced	Confident with strict, controlled straight-leg reps	3 to 4 sets of 12 to 15 reps, or add a brief pause at the top of each rep

A controlled lowering phase matters more here than the number of reps completed, since letting the legs drop quickly skips the controlled lowering that builds much of the strength.

Modifications and Variations

As an easier version, Captain’s Chair Knee Raise bends the knees during the raise, shortening the lever arm and making the movement much more accessible.

As a different technique with similar demands, Hanging Leg Raise removes the arm support, adding a grip and shoulder stability challenge on top of the same straight-leg movement.

Common Mistakes to Avoid

Bending the knees to cheat the range. Letting the knees bend partway through the set reduces the lever arm and makes the exercise easier, often unnoticed. Keeping the legs straight throughout, or switching to the knee raise when they can’t be kept straight, keeps the set at the difficulty intended.

Letting the legs drop quickly on the way down. Releasing control and letting gravity pull the legs down fast skips the lowering work that makes this exercise effective. A slow, resisted lowering phase builds more strength than a fast one.

Swinging the torso to generate momentum. Rocking the body forward and backward to help launch the legs upward turns a controlled core exercise into a momentum-driven one. Keeping the torso still and braced against the pad keeps the tension on the abs.

After Your Set

Standing and gently arching backward with the hands on the lower back stretches the front of the hips and abs after a set of leg raises. A brief low lunge on each side, sinking the hips forward, finishes releasing the hip flexors.

Going Deeper

Captain’s Chair Leg Raise is an advanced core exercise, since the long lever created by straight legs makes it a strength test even for people comfortable with easier ab movements. Straight legs are much harder to control than bent ones, so the knees tend to bend slightly unnoticed, which reduces the challenge while the rep count keeps climbing. Putting straight legs ahead of higher reps gets past a plateau sooner than doing more repetitions with bent knees.

Someone new to this exercise typically starts with a slight knee bend and works toward fully straight legs within the first few sessions, then builds toward a confident set of 10 to 12 controlled reps over six to eight weeks as the core adapts to the longer lever arm.

How to Know You’re Improving

Legs that stay straight throughout the raise
No noticeable swinging or momentum between reps
A lowering phase as controlled as the raise
A rep count that keeps climbing while the legs stay straight

Straight legs through a controlled range show progress more reliably than the rep count.

Muscles Worked

Rectus Abdominis (the abdominal muscles running down the front of the stomach, curling the pelvis up at the top of each raise)
Iliopsoas (the hip flexor group at the front of the hip, lifting the straight legs from hanging to horizontal)
Obliques (the muscles along the sides of the waist, stopping the legs from drifting to either side)
Transverse Abdominis (a deep core muscle that wraps around the torso like a corset, flattening the lower back so the long lever cannot pull it into an arch)

FAQ

Is Captain’s Chair Leg Raise better than the Knee Raise version? Neither is strictly better. This version’s straight legs create a much longer lever arm and a harder exercise, while Captain’s Chair Knee Raise offers a more accessible entry point, and most people move from the knee version to this one over time.

Why is keeping the legs straight so much harder? A straight leg places the body’s weight much farther from the hip joint than a bent knee does, which increases the torque the abs and hip flexors have to overcome to lift the same legs through the same range.

How does the knee raise version differ? Captain’s Chair Knee Raise bends the knees to shorten the lever arm and make the movement more accessible, while this version keeps the legs straight, which asks much more of the lower abs and hip flexors.

Is some ab or hip flexor soreness after this exercise normal? Yes, a worked, tired feeling through the abs and hip flexors by the end of a set is expected, given how demanding the straight-leg lever is. A sharp or pinching pain through the lower back or hip is different and worth having a doctor or physical therapist look at.

How long does it take to progress from knee raises to this exercise? Most people need several weeks of consistent knee raise training before straight-leg reps feel controlled, and building toward a confident set can take six to eight weeks beyond that.

Related to Captain’s Chair Knee Raise as the easier bent-knee version and Hanging Leg Raise as an unsupported alternative.