Dead Bug

The dead bug is a supine, contralateral anti-extension exercise: one arm and the opposite leg move while the ribs, pelvis, and lumbar spine stay organised. The floor gives you useful feedback, but it does not give you permission to force the back flat or chase a bigger reach. Use the core exercise hub for category-level choices; this page stays focused on dead bug setup, bracing, diagnostics, and progressions.

90/90 Breathing and Bracing Calibration

Start with a quiet calibration rather than moving straight into repetitions. Lie on your back with your feet on the floor, then lift the hips and knees to approximately 90 degrees so the shins are parallel to the floor. Place the arms toward the ceiling and let the back of the pelvis feel heavy. Keep the head and jaw relaxed. A small natural space under the lumbar area is not automatically a fault; the useful question is whether you can control the relationship between the ribs and pelvis as you breathe.

Take a slow inhale through the nose and notice whether the lower ribs expand without the shoulders lifting. Exhale gently for about four to six seconds. As the air leaves, allow the ribs to settle toward the pelvis and tighten the abdominal wall as if preparing for a light tap. Do not squeeze the glutes hard, jam the lower back into the floor, or hold the breath. After the exhale, take a small quiet inhale while keeping enough trunk tension to maintain the same shape. Repeat for three to five relaxed breaths.

You pass the 90/90 entry test when you can complete those breaths without the ribs flaring, the pelvis tipping forward, or the neck and hip flexors taking over. If the lower back arches as soon as the legs enter tabletop, keep one or both feet on the floor and practise the breathing position there. If you can hold the shape only by bearing down or breath-holding, reduce the effort. The brace should support controlled movement and breathing, not replace either one.

Dead Bug Form: Step by Step

1. Set your 90/90 tabletop position after the breathing calibration. Keep the hands over the shoulders and the knees over the hips.[1][2][3]
2. Exhale softly, set the ribs over the pelvis, and create a moderate brace. Keep the non-moving arm and leg quiet.[1][2][3]
3. Slowly reach one arm overhead while extending the opposite leg away from you. The leg may stay bent, or the heel may hover above the floor, depending on your current lever.[1][2][3]
4. Pause briefly at the farthest controlled point. The target is a quiet pelvis and steady lumbar contact, not touching the floor.[1][2][3]
5. Return the arm and leg to tabletop without rushing. Reset the breath, then repeat on the other side.[1][2][3]

Use a two- to three-second reach and return while learning. Keep the shoulders away from the ears and avoid pushing the moving heel or hand into the floor to create leverage. Think of balancing a glass on the front of the pelvis: if the glass would tip, shorten the reach or slow down.

Pelvis and Lumbar Diagnostics

The most useful diagnostic is what changes first when the lever gets longer. Film a set from the side and from above, or place one hand lightly under the lumbar area as a tactile check. Look for these distinctions:

• Lumbar arch: the back lifts as the arm or leg moves away. Return to the last position where the back was controlled, bend the moving knee, or use an arm-only regression. Do not solve this by pressing harder into the floor.[1][2][3]
• Anterior pelvic tip: the front of the pelvis rolls forward and the ribs flare. Exhale, bring the ribs back over the pelvis, and reduce the range. If the change appears only on the last few reps, end the set there.[1][2][3]
• Pelvic rotation: one side of the waistband turns or one hip hikes as the opposite limbs move. Reduce the reach, move more slowly, and make the non-moving leg less challenging by keeping its foot supported.[1][2][3]
• Hip-flexor takeover: the front of the hip grips while the abdomen loses tension. Return to the 90/90 breath, use a smaller lever, and avoid pulling the thigh tighter toward the chest between reps.[1][2][3]
• Neck or shoulder substitution: the chin pokes forward or the shoulder shrugs. Let the head rest, keep the gaze up, and shorten the arm reach before adding more leg range.[1][2][3]

A successful rep is the longest repeatable reach that passes all of these checks. Range is therefore individual and can change with fatigue; the floor position, not a fixed toe-touch target, is the standard.

Regressions and Progressions

Use the following ladder and move only when the 90/90 breath and the pelvis/lumbar checkpoints remain consistent:[1][2][3]

1. 90/90 breathing hold: keep both feet supported and practise three to five breaths with the ribs and pelvis organised.[1][2][3]
2. Heel-supported dead bug: lower one heel to a light tap while the other foot stays down. Alternate slowly.[1][2][3]
3. Arm-only dead bug: move one arm overhead while both feet remain supported. This is useful when the leg lever causes an immediate lumbar arch.[1][2][3]
4. Single-leg tabletop reach: keep one leg in tabletop and move the other through a short range before attempting the opposite arm.[1][2][3]
5. Contralateral dead bug: use the standard opposite-arm/opposite-leg pattern with bent knees or a hovering heel.[1][2][3]
6. Long-lever dead bug: straighten the moving leg farther or lower the heel closer to the floor, but change only one lever at a time.[1][2][3]
7. Paused or resisted dead bug: add a two-second pause, a light dumbbell in the hands, or a gentle stability-ball press after the bodyweight version is repeatable.[1][2][3]

For general strength and control, try 2–3 sets of 6–10 clean repetitions per side with 45–90 seconds of rest. For a warm-up, 1–2 sets of 4–6 per side is usually enough. For endurance, 2–3 sets of 12–20 per side can work if breathing and position stay unchanged. Keep two or three quality repetitions in reserve; the set ends when the brace checkpoint fails, not when the limbs can no longer move.

Side-Specific Progression Log

Record the left and right sides separately. The weaker or less coordinated side sets the progression level for the next session. A simple log can capture the information that a single total-rep number hides:

Date	Variation and lever	Left: clean reps / tempo	Right: clean reps / tempo	First failed checkpoint	Next adjustment
____	__________________	____ / ____	____ / ____	ribs / pelvis / lumbar / breath	__________________
____	__________________	____ / ____	____ / ____	ribs / pelvis / lumbar / breath	__________________

Progress when both sides complete all planned reps at the same tempo, with steady breathing and no visible change in pelvic or lumbar position, for two sessions. Add one or two repetitions per side, extend the lever slightly, add a pause, or use the smallest available resistance increase. If one side loses position first, keep the variation, match the cleaner side to the weaker side’s range, and regress that side rather than forcing symmetry through speed. This makes progression measurable without pretending that left and right coordination are identical.

Common Mistakes, Links, and Safety Boundary

Fast alternating reps, a dramatic back flattening, breath-holding, and an automatic floor touch are common ways to make the dead bug look harder while removing the intended control demand. If you want a static anti-extension hold, compare it with the plank. If opposite-limb control from a hands-and-knees position is a better fit, see the bird dog. The lying leg raise has a different two-leg hip-flexion demand, while plank alternatives helps with substitution decisions. For a complete session, use home ab workout rather than turning this single drill into an entire programme.

Stop if the exercise produces sharp pain, new tingling, or symptoms travelling into a limb. Persistent or concerning symptoms warrant advice from a qualified clinician. If you have a recent abdominal, hip, or spinal injury or are unsure whether floor exercise is appropriate, obtain individual guidance before loading the pattern.

Sources and Evidence Context

The sets, repetitions, and gradual progression framing is consistent with the ACSM Position Stand on Resistance Training Prescription. The advice to get symptoms checked before training follows the ACSM exercise preparticipation screening recommendations. Neither source studies the dead bug itself, and neither shows that it treats or prevents a specific condition.

References

1. Source. American College of Sports Medicine position stand. Progression models in resistance training for healthy adultsBack to claim
2. Source. 11.4 Axial Muscles of the Abdominal Wall, and ThoraxBack to claim
3. Source. Core Muscle Activity During Physical Fitness Exercises: A Systematic ReviewBack to claim

See our exercise methodology for how this evidence is applied and its limits.