The suitcase crunch is a bodyweight abdominal exercise performed lying flat that folds the torso and the bent knees toward each other at the same time to train the whole rectus abdominis. A standard crunch moves the ribs toward a fixed pelvis and a reverse crunch moves the pelvis toward fixed ribs; the suitcase crunch does both in one rep, so you balance on the tailbone at the top with only theabsholding the fold shut. Bending the knees keeps the lever shorter than a V-sit. Lifters program it as a bodyweight finisher after loaded core work.
What Muscles Does the Suitcase Crunch Work?
- Primary: Rectus abdominis (upper and lower abs)
- Secondary: Iliopsoas and rectus femoris (hip flexors), external obliques
- Tertiary: Transversus abdominis, serratus anterior, neck flexors
How Do You Set Up for the Suitcase Crunch?
Lie flat on your back on a mat with your legs extended and your heels resting on the floor. Reach your arms straight overhead so the backs of your hands rest on the mat, or hold them at your sides if the long lever is too much. Press your lower back into the mat, tuck your chin, and lift your heels an inch so tension starts before the first rep.
How Do You Perform the Suitcase Crunch?
- Fix your heels an inch off the mat with the legs long and the arms reaching overhead.
- Exhale and fold from both ends, curling the shoulder blades up while you bend the knees and draw them toward your chest.
- Reach the hands past the knees until you are balanced on your tailbone with the shins parallel to the floor.
- Squeeze the fold shut for one count, ribs pulled down and knees held over the hips.
- Open slowly, extending the legs and lowering the shoulders together until the heels hover and the hands reach back overhead.
- Pause with the lower back pressed into the mat, then begin the next fold.
What Are the Key Form Cues?
- Close the suitcase from both ends: the shoulders and knees should reach the top at the same moment, not the legs first and the torso chasing.
- Ribs down at the top: pull the sternum toward the pelvis as you balance so the abs, not the hip flexors, hold you up.
- Keep the heels hovering at the bottom; touching down lets the abs switch off between reps.
- Reach the arms long on the way down to keep the lever honest.
- Feel your lower back stay heavy on the mat right until the shoulders lift.
What Are the Most Common Mistakes?
- Throwing the arms forward to sit up: the arm swing carries the torso up and the abs only catch the fold at the top, so move the hands and knees at the same speed.
- Dropping the heels to the floor between reps: the abs relax every rep and the set becomes a series of starts, so keep them hovering.
- Arching the lower back as the legs extend: the long legs pull the pelvis into extension and the lumbar spine takes the load, so shorten the leg extension until the back stays flat.
- Pulling the knees in without lifting the shoulders: the rep becomes a reverse crunch and the upper abs miss the work, so peel the shoulder blades up on every rep.
- Rushing the open: falling back down skips the eccentric, so lower for two counts.
What Are the Best Suitcase Crunch Variations?
- Double crunch with feet down: knees bent and feet on the floor at the start, a regression that shortens the lever.
- Weighted suitcase crunch: a dumbbell held in the hands overhead loads the torso half of the fold.
- V-sit crunch: straight legs and straight arms meet over the hips, a longer lever for the same fold.
- Single-leg suitcase crunch: one leg folds while the other hovers, adding an anti-rotation demand.
- Swiss ball transfer crunch: the same fold while passing a stability ball from hands to feet at the top.
How Do You Progress the Suitcase Crunch?
- Hold a 5 pound dumbbell overhead once every set reaches the top of the rep range with the heels never touching down.
- Work from 8 reps up to 15 per set before adding load.
- Add a set per week from 2 up to 4 while the last set still closes fully.
- Hold the balanced top for two seconds, or lower over three counts, before the next load jump.
How Should You Program the Suitcase Crunch?
Place the suitcase crunch at the end of a core or lower body session, after cable crunches or hanging leg raises have done the loaded work. Train it two to three times a week for 3 sets of 8 to 15 reps with 45 to 60 seconds of rest. Pair it with a plank or a dead bug so the abs also train against extension between the folds.