# Hollow Body Tuck - Canonical: https://fitwill.app/exercise/7685/hollow-body-tuck/ - Media ID: 7685 - Primary muscle: Abs - Body part: Core - Equipment: Body Weight - Video: https://fitwill.app/videos/7685/hollow-body-tuck.mp4 ## Description The Hollow Body Tuck is a supine core exercise that teaches you what a braced, hollow-body position actually feels like before you progress to the full hollow hold. You lie on your back with your knees bent over your hips in a tabletop tuck, arms reaching straight up toward the ceiling, and press your lower back firmly into the floor. That pressure is the whole point: it forces the deep core and rectus abdominis to work continuously rather than letting your spine sag into the mat. This movement is one of the best starting points for anyone building toward gymnastics-style core work, handstands, L-sits, or advanced leg raises. Because the knees stay tucked close to the body, the leverage on the trunk is modest, which makes the position accessible to beginners while still demanding constant tension. Calisthenics athletes, martial artists, and lifters who feel their lower back taking over during leg raises will all benefit from spending time here. The primary muscles working are the abs, especially the rectus abdominis, with strong support from the transverse abdominis and obliques as they stabilize the ribcage and pelvis. The hip flexors hold the thighs in the tucked position, and the shoulders and arms stay lightly engaged from reaching vertically. Unlike a crunch, there is no spinal flexion through a range; the abdominals work isometrically to hold the trunk shape. Setup matters more than most people expect. Your lower back should stay flat against the floor for the entire set — the moment a gap opens between your lumbar spine and the mat, the core has lost the tension that makes this exercise work. Keep the knees stacked directly over the hips and the shins parallel to the floor rather than drifting toward your chest, and point your arms straight up so your hands sit over your shoulders. To execute well, exhale fully as you press the back down, then hold the tucked position with steady, shallow breathing. Rather than relaxing between breaths, maintain the same firm brace from start to finish. Sets of twenty to forty seconds work well, and the exercise is often used as the first rung on the ladder toward the full hollow body hold with extended legs. From a safety standpoint, the risk is low because you are lying down and loaded only by your own limb positions. The main thing to watch is neck and shoulder tension — people often shrug or jut the chin when the core starts to fatigue. If you feel your lower back lifting or your breath getting choppy, end the set, rest, and reset rather than pushing through a broken position. ## Instructions 1. Lie flat on your back on an exercise mat with your legs together and arms resting at your sides. 2. Lift your feet off the floor and bend your knees until they sit directly over your hips, shins parallel to the floor, so your legs form a boxed tabletop tuck. 3. Extend both arms straight up toward the ceiling so your hands are stacked over your shoulders, palms facing forward. 4. Exhale slowly and draw your belly button down, pressing your entire lower back flat against the mat. 5. Tuck your pelvis slightly under and pull your ribs down toward your hips until you feel continuous tension across the abdominal wall. 6. Hold this hollow body tuck position, keeping the knees over the hips and the lower back glued to the floor. 7. Breathe in shallow, controlled breaths through the hold without letting the brace relax or the back arch. 8. When the set ends, lower one foot at a time back to the floor, bend your knees, and rest on your side or roll to sit up rather than snapping straight upright. ## Tips & Tricks - If you cannot keep the lower back flat, your thighs are too heavy for the current position — bend the knees slightly more toward your chest instead of letting the pelvis tilt. - Watch your knees: they tend to drift toward the chest as you tire, which quietly shortens the leverage and steals tension from the abs. Hold them stacked over the hips. - Press the arms actively toward the ceiling rather than just holding them up; this keeps the shoulders from shrugging and helps lock the ribcage down. - Exhale hard during the first few seconds of the hold. The exhale is what drives the ribs down and flattens the back — inhaling before you brace usually leaves a gap under the lumbar spine. - Keep the chin neutral with your gaze straight up. Jutting the head forward is a sign the hold has become a neck exercise instead of a core exercise. - If you feel cramping in the front of the hips, the hip flexors are dominating. Re-brace the abs harder before the set and shorten the hold duration. - Quality beats duration here — a tight twenty-second hold with a flat lower back does more than a loose sixty-second hold. - Place a hand flat under the curve of your lower back during your first few sets to give yourself immediate feedback on whether the gap is opening. ## Frequently Asked Questions ### What muscles does the Hollow Body Tuck work? The rectus abdominis of the abs does most of the work isometrically, supported by the transverse abdominis and obliques, which hold the ribcage and pelvis stable. The hip flexors assist by keeping the thighs in the tucked position. ### Is the Hollow Body Tuck good for beginners? Yes, it is one of the most beginner-friendly entries into hollow body training because the bent-knee tuck reduces the leverage on the trunk. Beginners should start with shorter holds of fifteen to twenty seconds and prioritize a flat lower back over duration. ### Why does my lower back keep lifting off the floor during the Hollow Body Tuck? This happens when the abdominal brace relaxes and the hip flexors pull on the pelvis without the abs counteracting them. Exhale fully as you set up, tuck the pelvis slightly under, and if the gap still appears, bend the knees a little more toward your chest. ### How is the Hollow Body Tuck different from a regular hollow body hold? In the full hollow hold, the legs and arms are extended away from the body, which creates much longer levers and greater load on the trunk. The tuck keeps the knees bent over the hips and arms reaching up, making it the progression step before the extended version. ### How long should I hold the Hollow Body Tuck? Aim for twenty to forty seconds per set with a solid brace, resting briefly between sets. When you can hold forty seconds with the lower back flat the entire time, progress toward extending one leg at a time. ### Can I do the Hollow Body Tuck without a mat? Yes, any firm surface works, though a mat makes the position more comfortable on the spine and tailbone. Avoid soft beds or couches, since an unstable surface makes it hard to tell whether your lower back is truly flat. ### Should my arms stay vertical during the Hollow Body Tuck? Yes, keep the arms reaching straight up with hands over the shoulders, as this keeps the shoulder blades stable and the ribcage down. Letting the arms fall back over your head lengthens the lever and turns the hold into a much harder variation. ### What can I use instead of the Hollow Body Tuck? A dead bug trains a very similar braced, supine position but adds limb movement, while a bent-knee reverse crunch on the floor works the abs through a range of motion. Both are reasonable swaps if holding a static tuck aggravates your hips or lower back. ### Is it safe to hold my breath during the Hollow Body Tuck? No, keep breathing in shallow, steady breaths throughout the hold. Breath-holding spikes internal pressure and usually causes the brace to break down faster, so exhale on the setup and keep air moving for the rest of the set.