The V-sit crunch is a bodyweight core exercise performed lying on the floor that folds the torso and legs up into a V and lowers them again, training the abs and hip flexors through reps. Where theV-sitparks you in the balanced V and holds it, the V-sit crunch moves through that position on every rep, so the abs shorten against the weight of the legs and the shoulders, then lengthen under control on the way down. Lifters program it in a core block after their main lifts, paired with a rotation or side-flexion movement.
What Muscles Does the V-Sit Crunch Work?
- Primary: Rectus abdominis, iliopsoas and rectus femoris (hip flexors)
- Secondary: Obliques, tensor fasciae latae, adductor longus
- Tertiary: Transversus abdominis, serratus anterior, quadriceps
How Do You Set Up for the V-Sit Crunch?
Lie flat on a mat with your legs straight and together and your arms extended on the floor above your head, palms up. Press your lower back into the mat, pull your ribs toward your pelvis and point your toes. Lift your heels an inch off the floor and float your hands just above it, so the abs are already under tension before the first rep begins.
How Do You Perform the V-Sit Crunch?
- Brace your abs and breathe out as you begin lifting your shoulders and your legs off the floor at the same time.
- Fold at the hips so the straight legs rise toward vertical while the torso curls up to meet them.
- Reach your hands toward your shins or toes, balancing on your sit bones in a tight V.
- Hold the top for one count with the ribs pulled down and the legs still.
- Lower the torso and legs together over two to three seconds, hands returning overhead as the heels drop.
- Stop just above the floor with heels and hands hovering, then breathe in and begin the next rep.
What Are the Key Form Cues?
- Fold from the middle: think of your hips as the hinge and let the shoulders and heels arrive at the top together, not one after the other.
- Long on the way down: reach the hands and heels away from each other as you lower so the abs stay loaded through the whole eccentric.
- Keep the chin tucked and the eyes on your knees so the neck stays out of the movement.
- Squeeze the thighs together so the legs move as one lever.
- Exhale hard at the top to pull the ribs down and finish the crunch.
What Are the Most Common Mistakes?
- Throwing the arms to build momentum: the abs are bypassed and the hip flexors yank the legs up, so lift the arms with the shoulders rather than swinging them.
- Letting the heels and hands hit the floor between reps: the tension resets to zero on every rep, so hover both an inch off the mat.
- Arching the lower back on the way down: the lumbar spine hyperextends under the pull of the hip flexors and its joints take the strain, so keep the ribs down and shorten the range.
- Bending the knees to reach the top: the lever shortens and the difficulty drops, so keep the legs straight or accept a smaller V.
- Poking the chin forward: the neck strains and the chest stays flat, so tuck the chin and lead with the sternum.
What Are the Best V-Sit Crunch Variations?
- Tuck V-sit crunch: knees bent and pulled to the chest on each rep, the regression for building the pattern.
- Weighted V-sit crunch: a light dumbbell or medicine ball in the hands adds load to the torso.
- Alternating V-up: one leg rises at a time while the opposite hand reaches for it, halving the leg load.
- Side V-up: performed on one side so the obliques, not the abs, do the folding.
- Kettlebell V-up: a kettlebell held overhead through the rep, the same movement with a heavier top.
How Do You Progress the V-Sit Crunch?
- Add a 5 to 10 pound dumbbell or medicine ball in the hands once you finish every set at 15 clean reps.
- Add 2 reps per set each week, working from 8 up to 15.
- Add one set per session, up to 4, before adding load.
- Slow the lowering phase to four seconds, or hold the top V for three counts, before changing anything else.
How Should You Program the V-Sit Crunch?
Program the V-sit crunch in a core block at the end of a session, after your main lifts and before any static holds, since it needs fresh hip flexors. Use it two to three times per week for 3 to 4 sets of 8 to 15 reps, resting 45 to 60 seconds between sets. Pair it with a side V-up or a cable chop so the obliques get their own work.