The raised leg crunch is a bodyweightabsexercise performed lying on the floor with the legs held vertical, so the rectus abdominis flexes the trunk against fixed hips. Holding the legs up removes the hip flexor drive that a flat-footed crunch borrows and forces the abs to hold the pelvis still while the ribcage curls toward it. The range is short, the lever is long, and the lower back stays pressed into the floor for the whole set. Lifters use it as a floor-based core finisher or in the warm-up before heavy squats and deadlifts.
What Muscles Does the Raised Leg Crunch Work?
- Primary: Rectus abdominis (six-pack)
- Secondary: External and internal obliques
- Tertiary: Hip flexors (iliopsoas), transverse abdominis, sternocleidomastoid (front of neck)
How Do You Set Up for the Raised Leg Crunch?
Lie on your back on a mat with your arms at your sides. Raise both legs until they point at the ceiling, knees straight or softly bent, feet together. Press your lower back into the floor so there is no gap under your lumbar spine. Place your fingertips lightly behind your ears or cross your hands over your chest, tuck your chin slightly, and hold the legs still before the first rep.
How Do You Perform the Raised Leg Crunch?
- Fix the legs at vertical and lock the pelvis flat so the hips do not move during the rep.
- Exhale and curl your ribcage toward your pelvis, lifting the head, shoulders and upper back off the floor in sequence.
- Stop when your shoulder blades clear the floor and your abs are fully shortened; the lower back stays down.
- Hold the top for one second, squeezing the abs hard with the legs still pointing at the ceiling.
- Lower under control, uncurling from the upper back down until your shoulder blades touch the floor.
- Reset the legs to vertical if they drifted forward, then start the next rep from the flat-back position.
What Are the Key Form Cues?
- Curl, do not sit up: bend the spine like a rolling mat instead of hinging at the hips, so the abs shorten, not the hip flexors.
- Pin the lower back down: press the lumbar spine into the floor for the whole rep; if it lifts, the legs are drifting.
- Keep the legs as still as a wall: they are the anchor the ribcage curls toward.
- Reach the chest toward the shins rather than the chin toward the knees.
- Breathe out through the curl and let the exhale finish at the top squeeze.
What Are the Most Common Mistakes?
- Letting the legs drop or swing toward your chest: the hip flexors take over and the abs stop working; keep the legs frozen at vertical.
- Pulling on the head with your hands: it strains the neck and lifts the shoulders with arm force; keep the fingertips light and let the abs do the lifting.
- Coming up too high: once the shoulder blades are well off the floor the hip flexors finish the rep; stop at the point of full abdominal contraction.
- Arching the lower back to get the legs up: it loads the lumbar discs at the start of every rep; bend the knees more or lower the legs slightly if it happens.
- Rushing the descent: dropping back to the floor throws away half the rep; lower over two seconds.
What Are the Best Raised Leg Crunch Variations?
- Bent-knee raised leg crunch: hips and knees at 90 degrees shorten the lever for beginners.
- Weighted raised leg crunch: a dumbbell or plate held on the chest adds load once bodyweight reps stop being hard.
- Raised leg toe touch crunch: reaching the hands toward the toes lengthens the top of the curl.
- Single leg raised crunch: one leg vertical, one hovering, which turns the rep into an anti-rotation drill.
- Kneeling cable crunch: the same trunk flexion at a high pulley with adjustable load.
How Do You Progress the Raised Leg Crunch?
- Add load only after 15 clean bodyweight reps: start with a 5 pound plate on the chest and add 5 pounds per step.
- Work from 10 reps up to 20 per set before adding weight or slowing down.
- Add a set at a time, from 2 up to 4, keeping every rep at full contraction.
- Hold the top for three seconds, or lower the legs to 45 degrees to lengthen the lever.
How Should You Program the Raised Leg Crunch?
Program the raised leg crunch late in the session as an abdominal accessory, after your compound lifts. Two to three times per week is plenty. Do 3 to 4 sets of 12 to 20 reps with 45 to 60 seconds of rest. Pair it with hanging knee raises or an anti-extension hold so the whole trunk gets trained. Stop the set when the lower back leaves the floor.