# Suitcase Crunch - Canonical: https://fitwill.app/exercise/10544/suitcase-crunch/ - Media ID: 10544 - Primary muscle: Abs - Body part: Core - Equipment: Body Weight - Video: https://fitwill.app/videos/10544/suitcase-crunch.mp4 ## Description The Suitcase Crunch is a seated, body-weight core exercise that gets its name from the way your body folds shut like a suitcase at the top of each rep. You balance on your sit bones with your torso leaned back and legs held off the floor, then pull your knees in toward your chest while your upper body curls forward to meet them. From there you extend back out to a long, hovering V-sit position, keeping your feet and torso off the ground the entire time. This movement trains the rectus abdominis through a full curling range, but the real challenge comes from the transitions. Your hip flexors drive the legs in and out, your deep core keeps you from rocking backward or collapsing, and your obliques work hard to hold a square, stable torso as your center of gravity shifts. Because you never lie down or rest your feet, your midsection stays under tension from the first rep to the last. The Suitcase Crunch suits intermediate trainees who already handle basic crunches and lying leg raises comfortably and want a harder, more integrated core challenge. It shows up frequently in calisthenics and martial arts conditioning, and it transfers well to anything that demands a strong hollow-body position, from bar work to sprinting. It requires no equipment beyond floor space, though a thin mat under your sit bones makes the exercise far more comfortable. Setup and balance are what separate a good Suitcase Crunch from a sloppy one. Sit with your knees bent and feet flat, lean your torso back until you feel your abdominals engage, then lift your feet so your shins are roughly parallel to the floor. From that anchor point, extend your legs out and torso back into a long hollow shape, then close the suitcase: knees drive in as your chest curls down toward your thighs and your arms sweep forward past your sides. Your weight should stay on your sit bones, not roll onto your tailbone. Execute each rep with a deliberate exhale as you close, letting the abs shorten fully at the top, then inhale as you extend back out under control. Move slowly enough that your feet never touch down and your lower back never slaps the floor. If you find yourself rocking for momentum, reduce the range by keeping your knees more bent, or hold the tucked position briefly at the top instead of extending all the way out. A few practical points keep this exercise productive and safe. Keep your chest tall on the extension rather than letting your spine round into a slouch, and keep your neck neutral by looking forward instead of jamming your chin down. Stop the set when your balance breaks down, not just when your abs burn, because form tends to deteriorate into hip-flexor yanking and lower-back strain once fatigue sets in. Three sets of eight to twelve controlled reps is a solid working dose for most people. ## Instructions 1. Sit on a mat with your knees bent and feet flat on the floor, hands resting lightly beside your hips. 2. Lean your torso back to roughly a 45-degree angle until you feel your abdominals take the load, then lift your feet so your shins are parallel to the floor and your weight sits on your sit bones. 3. Extend your legs out in front of you and lean your torso slightly farther back so your body forms a long, open V, with your arms reaching alongside your legs. 4. Brace your abdominal wall as if bracing for a light push, and keep your chest lifted rather than slumped. 5. Exhale as you close the movement: drive your knees in toward your chest while curling your upper body forward so your chest and thighs approach each other, arms sweeping forward past your knees. 6. Pause for a beat in the tucked position, squeezing your abs fully with your feet still off the floor. 7. Inhale as you extend back out with control, opening the suitcase until you return to the long V position without letting your heels touch down. 8. Keep your gaze forward and your shoulders relaxed away from your ears throughout the rep. 9. Complete your target reps without resting your feet between them, then set your feet down, shake out your hips, and reset your balance before the next set. ## Tips & Tricks - If you rock backward every time you close the suitcase, you are moving too fast; slow the knee drive down and let the abs, not momentum, fold you in. - Keep your weight on your sit bones rather than rolling onto your tailbone — if your tailbone aches, you have leaned back too far or rounded your pelvis under. - Your arms are counterweights: sweeping them forward as the knees come in makes the tuck easier, and holding them alongside your extended legs makes the open position harder. - Do not yank with your neck or shove your chin to your chest; the curl comes from your ribcage moving toward your pelvis, and your eyes stay forward. - If your hip flexors cramp before your abs fatigue, your legs are probably staying too straight on the extension — shorten the lever with softer knees until your core catches up. - Lower back discomfort during the open phase means your torso has dropped too low; raise your chest a few degrees so your abs hold the position instead of your spine. - Aim to keep your knees and ankles together through the whole rep — letting the legs drift apart turns the movement into two uncoordinated half-reps. - Adding a one-second squeeze at the tucked position builds more abdominal work than rushing extra reps. - Place a folded mat or towel under your sit bones if the floor is hard; comfort in the balance point lets you focus on the contraction instead of the surface. ## Frequently Asked Questions ### What muscles does the Suitcase Crunch work? The rectus abdominis does most of the trunk curling, while the hip flexors power the legs in and out. Your obliques and deep core stabilize your torso and keep you balanced on your sit bones throughout the set. ### Is the Suitcase Crunch suitable for beginners? It is challenging because you balance on your sit bones with your feet off the floor the whole time. Beginners should master basic crunches and lying leg raises first, then start with smaller extensions, keeping the knees well bent. ### Why do my hip flexors burn more than my abs during Suitcase Crunches? Straight legs make the hip flexors the dominant lever movers. Keep your knees more bent and focus on curling your ribcage toward your pelvis at the top so the abdominals share the load. ### Should my feet touch the floor between reps? No — keeping the feet hovering is what maintains constant tension on the core. If you need a rest, set your feet down deliberately, reset your balance, and resume rather than letting your heels tap down rep by rep. ### How is the Suitcase Crunch different from a regular crunch or V-up? A regular crunch happens lying on the floor with your torso only, and a V-up uses straight legs and a fast snap. The Suitcase Crunch stays balanced on the sit bones the entire time and closes with bent knees, making it slower, more controlled, and more balance-dependent. ### How many reps and sets should I do? Two to four sets of eight to twelve controlled reps works well for most trainees. Once you can complete all sets smoothly with full extensions, add a pause at the tucked position or slow the open phase to progress. ### What can I use instead of the Suitcase Crunch? Lying leg raises, hollow-body holds, and V-ups train similar musculature with different demands. If balance on the sit bones is the limiting factor, a hollow hold with hands by your hips is the closest substitute without the folding action. ### Is it normal for my tailbone to feel sore? Mild pressure on the sit bones is expected, but sharp tailbone pain means your pelvis has tucked under and you are resting on bone instead of balancing. Sit slightly taller and place a folded mat underneath before continuing. ### Can I add weight to the Suitcase Crunch? Yes, once your form is solid you can hold a light dumbbell or medicine ball at your chest to increase the curling load. Add weight only when you can complete your target reps without rocking or losing the hovering position. ### Should I avoid the Suitcase Crunch if I have lower back issues? Because the exercise loads the spine in a flexed, hovering position, anyone with a history of lower back problems should get clearance from a qualified professional first. If cleared, keep the extension shallow and stop any rep that produces pain rather than muscle fatigue.