Dead Bug Exercise: How to Do It, Muscles Worked and Mistakes to Avoid
The dead bug trains your deep core to keep your lower back still while your arms and legs move. Here is how to do it, which muscles it works, the mistakes to avoid and how to progress it.
The dead bug exercise is a floor-based core move: you lie on your back with your arms and legs in the air, then slowly lower an opposite arm and leg while your lower back stays still. It trains your deep abdominal muscles to stop your spine from arching. It needs no equipment and suits beginners, adults over 40 and people easing back from back pain.
| Primary muscles | Transversus abdominis, rectus abdominis, obliques |
| Secondary muscles | Hip flexors (holding the legs up), shoulder stabilizers |
| Equipment | None; a mat for comfort |
| Difficulty | Beginner |
| Movement pattern | Core: anti-extension (resisting an arching lower back) |
| Good for | Core control, back-friendly ab training, warm-ups, beginners |
| Starting sets and reps | 2 sets of 6 to 10 slow reps per side, 2 to 4 days a week |
How to do a dead bug
- Lie on your back on a mat with your knees bent and feet flat. Reach both arms straight up so your hands are over your shoulders.
- Lift your feet one at a time until your hips and knees are bent to about 90 degrees, shins parallel to the floor. This is the tabletop position.
- Breathe out and let your ribs sink toward the floor so your lower back rests gently on the mat. Keep that contact for the whole set.
- Slowly lower your right arm overhead while you straighten your left leg toward the floor, heel hovering just above it.
- Stop where your lower back starts to lift or your ribs flare. That is your range for today, and it will grow.
- Bring the arm and leg back with the same control, then repeat with your left arm and right leg. Count each side as one rep.
- Take about 2 to 3 seconds to lower and the same to return, with a short pause between sides.
Form cues
- Feel: the front of your stomach working while your lower back stays heavy and quiet. A burning hip or a sore back means the reach is too big.
- Look: straight up at the ceiling, head resting on the floor, chin slightly tucked.
- Breathe: out as the arm and leg lower, in as they come back.
- Pace: slower is harder. When you rush, the arch sneaks in.
Muscles worked
The dead bug is an anti-extension exercise. As your arm and leg move away, their weight tries to tip your pelvis and arch your lower back, and your abdominal wall has to stop it. The transversus abdominis (the deep layer that wraps around you like a belt), the rectus abdominis (the six-pack muscle) and the obliques share that job, while your hip flexors hold your legs up.
Research on the dead bug comes from small lab studies. In 44 healthy women measured with ultrasound, the dead bug produced a bigger increase in transversus abdominis thickness than four other Pilates moves, including the hundred and the side plank (1). In 13 healthy adults, it thickened the external obliques more than the glute bridge or a hip extension did, while the transversus abdominis worked to a similar degree across all six exercises tested, plank and bird dog included (2). A study of 10 healthy men found that trunk muscle activity generally rose as the dead bug and three other stabilization exercises were made harder, which supports progressing it in steps (3).
Keep this in proportion: ultrasound and electromyography (EMG) show that a muscle is working, not that it will grow faster than with another exercise, and the groups tested were small and healthy. The dead bug is a light load, so treat it as a control and endurance drill rather than a strength builder.
Common mistakes
- Letting the lower back arch. Stopping this is the whole point. Fix: shorten the reach, keep the moving knee bent, or move one limb at a time.
- Rushing the reps. Speed lets momentum do the work. Fix: count 2 to 3 seconds down and 2 to 3 seconds back.
- Holding your breath. Fix: breathe out as you lower and in as you return. If you cannot breathe steadily, pick an easier version.
- Crushing your back into the floor. Pressing so hard that your neck tenses defeats the point. Fix: gentle contact, head down, jaw relaxed.
- Letting the other limbs drift. Fix: keep the resting arm over your shoulder and the resting leg over your hip.
- Resting the heel on the floor. That gives your abs a break. Fix: hover just above it.
Variations: easier and harder
| Level | Variation | Why or when |
|---|---|---|
| Easiest | Heel taps: arms resting on the floor, lower one bent leg to tap the heel down, then switch | First week, an irritable back, or sore shoulders |
| Easier | Legs only, or arms only | Builds coordination before you combine the two |
| Standard | Opposite arm and leg, as described above | The classic version for most people |
| Harder | Pause dead bug: hold the lowered position for 3 seconds | More time under tension with no equipment |
| Harder | Ball dead bug: squeeze an exercise ball between your hands and knees, then extend one arm and the opposite leg while the other pair holds the ball | Adds tension through the whole front of the core |
| Hardest | Weighted dead bug: a light dumbbell or plate held over your chest, or ankle weights | For trained people; keep the same strict range |
The first four versions need nothing but a mat. If your knees complain, keep the moving knee bent at 90 degrees. If your back is irritable, stay with heel taps and a short range. With no weight on your wrists, it is a useful swap for planks and bird dogs when wrists are sore. There is no dead bug machine; some gyms add a cable or band anchored behind your head.
Sets, reps and how often
The American College of Sports Medicine recommends 2 to 3 training days a week for beginners and, for muscular endurance, light to moderate loads for more than 15 reps with rests under 90 seconds (4). Bodyweight core drills sit in that endurance zone.
| Goal | Sets and reps | How often |
|---|---|---|
| Beginners and back-friendly core | 2 sets of 6 to 8 slow reps per side | 2 to 5 days a week |
| Core endurance | 2 to 3 sets of 12 to 20 per side, rest under 90 seconds | 2 to 4 days a week |
| Strength and muscle | 3 sets of 8 to 12 per side with a weighted or banded version | 2 to 3 days a week, alongside other core work |
Progress one thing at a time: more reps, then slower lowering, then a pause, then load. Once 20 slow reps per side feel easy, move on to a harder anti-extension exercise such as the plank.
Is the dead bug good for lower back pain?
It can be part of a good plan, but it is not a special cure. A 2021 Cochrane review of 249 trials found that exercise reduces chronic low back pain by about 15 points on a 100-point scale compared with no treatment, usual care or placebo, a difference patients notice. The gain in day-to-day function was smaller, about 7 points (5). We grade that claim in our evidence index.
The dead bug is a typical stabilization, or motor control, exercise. A Cochrane review of 29 trials with 2,431 people found motor control exercise beat minimal intervention for pain but was no better than other forms of exercise, and concluded that the choice should depend on preference, cost and safety (6). In short, no single back exercise has been proven best; choose ones you can do without flaring pain, and stick with them. Our guide to lower back pain exercises builds the dead bug into a 15-minute routine.
What are the big 3 exercises for the core?
The “big three” usually means the trio spine biomechanist Stuart McGill uses for back health: the curl-up, the side bridge (side plank) and the bird dog. His lab has measured muscle activity across easier and harder forms of all three to guide progressions (7). The dead bug is not one of them, but it trains the same skill of holding the spine still while the limbs move. Our bird dog exercise guide covers the third member of the trio.
Will the dead bug, or 100 sit-ups a day, give you abs?
Not on its own. Visible abs depend mostly on how much fat covers them. In a small trial, 24 sedentary adults did seven abdominal exercises, 2 sets of 10 reps, five days a week for six weeks on a steady diet. Their abdominal fat, waist size and body fat percentage did not change, although their ab endurance improved (8). A hundred sit-ups a day runs into the same limit.
There is also no single number one ab exercise, because different moves bias different parts of the abdominal wall. Our breakdown of bodyweight ab exercises covers which moves work what. There is no quick route to a six-pack: steady fat loss plus regular core training is the honest one.
Is it safe? Who should be careful
Your spine is supported by the floor and does not bend under load, so this is one of the gentlest core exercises. A few rules still apply:
- Pain rule. Effort and mild muscle fatigue are fine. Stop if you feel sharp pain, pain that travels down a leg, or numbness or tingling, and get it checked if it does not settle.
- Back pain. Start with heel taps and a short range. If even those hurt, see a physical therapist.
- Diastasis recti. A 2023 review of 16 trials found that, compared with usual care, abdominal exercise after pregnancy narrowed the gap between the ab muscles by only about 0.43 cm, too little to matter clinically (9). In 13 healthy adults, the midline tissue (linea alba) was stretched no more during the dead bug than during planks, the bird dog or bridges (2). So there is no evidence it closes a gap, and little reason to think it widens one. If your belly domes along the midline, ease off and see a pelvic health physical therapist.
- Pregnancy. Canadian guidelines encourage activity throughout pregnancy for women without medical reasons to avoid it, and advise anyone who feels lightheaded, nauseous or unwell lying flat on their back to switch position (10). The bird dog, done on hands and knees, is a natural swap. Check with your obstetric provider.
- Hip or groin discomfort. Keep the moving knee bent so your hip flexors work less.
Get emergency care if back pain comes with numbness, tingling or weakness in both legs, loss of feeling around your genitals or bottom, or new bladder or bowel problems (11). This page is general information, not medical advice; see our medical disclaimer.
Watch it done
Our video The Only 3 Exercises You Need to Rebuild Muscle After 70 teaches the dead bug as the fourth of its five moves. Its coaching matches this page: knees at 90 degrees, lower back gently pressed down, opposite arm and leg lowered only as far as you can go without arching, and a breath out on the way down. Its beginner option, moving only the legs or only the arms, is the same as ours, and it suggests 2 to 3 sets of 10 reps per side.
Looking for your next move? Browse every guide in our exercise library, sorted by muscle group, equipment and level.
Round out your core work with the side plank for the obliques.
Sources
- Tsartsapakis I, et al. Transversus abdominis ultrasound thickness during popular trunk-Pilates exercises in young and middle-aged women. J Funct Morphol Kinesiol. 2023;8(3):110. PubMed 37606405
- Bini RR, Bini AF. Comparison of linea alba length and core-muscles engagement during core and lower back orientated exercises. J Bodyw Mov Ther. 2021;28:131-137. PubMed 34776131
- Kim CR, et al. Electromyographic changes in trunk muscles during graded lumbar stabilization exercises. PM R. 2016;8(10):979-989. PubMed 27317910
- American College of Sports Medicine. American College of Sports Medicine position stand. Progression models in resistance training for healthy adults. Med Sci Sports Exerc. 2009;41(3):687-708. PubMed 19204579
- Hayden JA, et al. Exercise therapy for chronic low back pain. Cochrane Database Syst Rev. 2021;9(9):CD009790. PubMed 34580864
- Saragiotto BT, et al. Motor control exercise for chronic non-specific low-back pain. Cochrane Database Syst Rev. 2016;2016(1):CD012004. PubMed 26742533
- McGill SM, Karpowicz A. Exercises for spine stabilization: motion/motor patterns, stability progressions, and clinical technique. Arch Phys Med Rehabil. 2009;90(1):118-126. PubMed 19154838
- Vispute SS, et al. The effect of abdominal exercise on abdominal fat. J Strength Cond Res. 2011;25(9):2559-2564. PubMed 21804427
- Benjamin DR, et al. Conservative interventions may have little effect on reducing diastasis of the rectus abdominis in postnatal women: a systematic review and meta-analysis. Physiotherapy. 2023;119:54-71. PubMed 36934466
- Mottola MF, et al. 2019 Canadian guideline for physical activity throughout pregnancy. Br J Sports Med. 2018;52(21):1339-1346. PubMed 30337460
- NHS. Back pain. Page last reviewed 5 March 2026. nhs.uk
This article is for informational purposes only and is not medical advice. See our Medical Disclaimer before changing your exercise, diet, or supplement routine.
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Frequently asked questions
What kind of exercise is a dead bug?
The dead bug is a core stability exercise, specifically an anti-extension move. You lie on your back with your arms pointing at the ceiling and your hips and knees bent to 90 degrees, then slowly lower an opposite arm and leg while keeping your lower back gently on the floor. It trains the deep abdominal muscles to stop your spine from arching, needs no equipment and is suitable for beginners.
What are the big 3 exercises for the core?
The u2018big threeu2019 usually refers to the trio spine biomechanist Stuart McGill uses for back health: the curl-up, the side bridge (side plank) and the bird dog. His lab has published muscle-activity data on easier and harder forms of all three. The dead bug is not one of them, but it trains the same skill of holding the spine still while the limbs move, and it pairs well with them.
How many reps of dead bugs should I do?
Beginners can start with 2 sets of 6 to 8 slow reps per side, counting each side as one rep. For core endurance, build to 2 to 3 sets of 12 to 20 per side with rests under 90 seconds, in line with the American College of Sports Medicineu2019s advice of high reps and short rests for endurance. Take 2 to 3 seconds to lower and return, and stop each rep before your lower back arches.
Is the dead bug good for diastasis recti?
There is no evidence that it closes the gap. A 2023 review of 16 trials found that, compared with usual care, abdominal exercise after pregnancy narrowed the gap by only about 0.43 cm, too little to matter clinically. A small ultrasound study found the dead bug stretched the midline tissue no more than planks, bird dogs or bridges. It is a reasonable, gentle core exercise, but if your belly domes along the midline, ease off and see a pelvic health physical therapist.
Will 100 sit-ups a day get you abs?
Not by themselves. Whether abs show depends mostly on body fat. In a six-week trial, sedentary adults who did seven abdominal exercises five days a week improved their ab endurance but did not lose abdominal fat or waist size. No single exercise, including the dead bug, is the number one ab move; combine regular core work with gradual fat loss.
