# Lying Floor Quarter Twisting Crunch - Canonical: https://fitwill.app/exercise/9296/lying-floor-quarter-twisting-crunch/ - Media ID: 9296 - Primary muscle: Abs - Body part: Core - Equipment: Body Weight - Video: https://fitwill.app/videos/9296/lying-floor-quarter-twisting-crunch.mp4 ## Description The Lying Floor Quarter Twisting Crunch is a body weight abdominal exercise performed on the floor with your knees bent and hands lightly supporting the back of your head. Unlike a full sit-up, this version uses a short, deliberate crunch range — only your shoulder blades lift clear of the floor — and adds a slight rotation of the torso toward one side as you curl up. That small twist shifts some of the work from the front of the abs into the obliques along the sides of your waist, while the rectus abdominis still does most of the spinal flexion. This movement suits people who want to train the midsection without equipment and without loading the lower back with long-lever leg raises or heavy flexion work. Beginners can use it to learn what a proper crunch feels like, since the quarter range keeps the rep honest and easy to control. More experienced lifters often use it as a finisher at the end of a core session or as a higher-repetition burnout between heavier compound days, alternating the twist left and right across reps or sets. Setup matters more than most people expect. Lying on your back with knees bent and feet flat gives your pelvis a stable base, and placing your hands behind your head — rather than pulling on your neck — keeps the work in the trunk. Because the range is short, any slack in your setup shows up immediately: if your feet drift, your hips roll, or your elbows flare forward, the twist turns into momentum instead of muscle. Keep your lower back in gentle contact with the floor throughout so the movement stays a crunch rather than a hip-hinge. To execute it well, brace your midsection first, then curl your ribcage down toward your hips while rotating one shoulder across your body. Pause briefly at the top where your shoulder blade is just off the floor, feel the abs and the oblique on the twisting side working, then lower under control until your head and shoulders settle back down. Exhale on the way up, inhale on the way down, and alternate sides rep by rep or complete all reps on one side before switching. The most common errors are pulling the head forward with the hands, bouncing quickly through the short range, and twisting so far that the movement becomes a sit-up rotation instead of a quarter crunch. Keep the rotation modest — roughly toward the opposite knee or slightly past the midline — and let the abdominal muscles, not momentum, drive every inch of the rep. If your neck fatigues before your abs, rest it more heavily in your fingertips and reduce the range slightly. ## Instructions 1. Lie on your back on an exercise mat or the floor with your knees bent to about 90 degrees and your feet flat on the floor, hip-width apart. 2. Place your hands lightly behind your head or ears with your elbows open to the sides, and let your head rest back into your fingertips rather than being held forward. 3. Draw your belly button in slightly to brace your deep core, and press your lower back gently toward the floor so your pelvis is level. 4. Exhale and curl your ribcage toward your hips, lifting only until your shoulder blades clear the floor — this is the quarter range. 5. As you curl up, rotate your torso so one shoulder travels toward the opposite knee, keeping the twist small and controlled rather than swinging the elbow across. 6. Pause for a beat at the top and squeeze the abs and the oblique on the twisting side; do not pull with your hands or push your chin forward. 7. Inhale and lower slowly, unrotating as you descend, until your head and shoulder blades rest back on the floor. 8. Alternate sides on each repetition, or complete all reps on one side before switching, keeping your feet planted and hips square throughout. 9. Reset your brace between reps if you feel your lower back arch away from the floor, and stop the set once your form breaks down. ## Tips & Tricks - The quarter range only works if you actually stop there — lifting past it turns the rep into a sit-up and shifts effort toward the hip flexors. - Keep your elbows wide and your hands relaxed behind your head; if you see your elbows drifting forward, you are curling with your arms instead of your abs. - Chin position is a common failure point: hold an imaginary apple under your chin so your head stays neutral instead of jutting forward at the top. - If your hips rock side to side as you twist, slow the rotation down and think about rotating from the ribcage, not from the pelvis. - The twisting side's oblique does much of the rotational work, so make sure you train both directions evenly across your sets. - Do not let your feet lift or your heels drag as you curl — if they do, your knees may be too close or too far from your hips; adjust the foot position until your legs stay still. - Since the range is short, tempo matters more than speed; a one-second pause at the top makes the quarter crunch far harder than rushing through it. - If your neck tires before your abs, place your fingertips at the base of the skull for support and reduce the crunch height slightly. - Keep your lower back lightly touching the floor for the entire set — if it arches or presses down hard, you are over-tensioning the hip flexors instead of bracing the abs. ## Frequently Asked Questions ### What muscles does the Lying Floor Quarter Twisting Crunch work? The rectus abdominis — the front wall of the abs — drives the crunch, while the obliques on the twisting side handle the rotation. The deep core stabilizes the pelvis and keeps the lower back in contact with the floor. ### Why is it called a quarter crunch instead of a full crunch? Because you only lift until your shoulder blades clear the floor, roughly a quarter of the distance toward a full sit-up. This short range keeps tension on the abs and limits hip flexor involvement. ### Is the Lying Floor Quarter Twisting Crunch good for beginners? Yes. The short range, body weight resistance, and stable floor position make it a low-risk way to learn crunch mechanics and rotation control before progressing to harder twisting variations. ### How far should my shoulder rotate during the twist? Only slightly — aim for the shoulder to travel toward the opposite knee or just past the midline. If your elbow is swinging across your body, the range is too large and momentum is taking over. ### Should I alternate sides every rep or do one side at a time? Both work. Alternating reps keeps the muscles balanced rep to rep, while completing all reps on one side makes it easier to feel and correct the oblique engagement before switching. ### Why does my neck hurt when I do this exercise? You are most likely pulling your head forward with your hands or jutting your chin at the top. Keep your hands relaxed behind your ears, support the head rather than lift it, and let the abs curl the torso. ### Do I need a mat for the Lying Floor Quarter Twisting Crunch? No, a mat is optional. It simply cushions the spine and shoulder blades on hard floors; on carpet or a soft surface you can perform the exercise directly on the floor. ### How many reps should I do? Because the resistance is light and the range short, higher repetitions work well — start with sets of 10 to 15 per side and progress by slowing the tempo or adding a pause at the top. ### What can I substitute if twisting crunches bother my lower back? Try a plain floor crunch without the twist, or a dead bug, both of which train the abs with less spinal rotation. If discomfort persists, check with a qualified professional before continuing. ### Will the Lying Floor Quarter Twisting Crunch reduce fat around my waist? No exercise spot-reduces fat from a specific area. This movement strengthens and builds endurance in the abs and obliques, while overall fat loss depends on diet and total activity.