Dead Bug

Anton YefanovUpdated September 6, 2026

The dead bug starts lying on the back with the arms reaching up and the hips and knees bent to ninety degrees. From there one arm lowers overhead while the opposite leg extends toward the floor, and the whole job of the trunk is to stop the lower back lifting away from the ground. The rectus abdominis and transverse abdominis resist that extension, while the obliques control the diagonal loading created by using opposite limbs. Range is determined entirely by control, so reps stop the moment the back starts to arch.

How to do the Dead Bug

Lie on your back on a mat with your arms reaching straight toward the ceiling.
Lift your feet so your hips and knees are both bent to ninety degrees.
Press your lower back gently into the floor and brace your abdominals.
Exhale and lower one arm overhead while extending the opposite leg toward the floor.
Stop just short of the floor while the lower back stays flat, then inhale and return.
Repeat with the opposite arm and leg, alternating for the prescribed reps.

Muscles worked

Primary:: Core

Why train it

Trains anti-extension core control in a position that keeps load off the spine.
Needs nothing but a mat, so it fits home, travel and rehab adjacent programming.
Scales in both directions by changing limb range or adding light external load.

Common mistakes

Letting the lower back arch off the floor, which means the core has stopped resisting extension.
Moving faster than you can breathe, which turns a control drill into a flailing exercise.
Reaching further than you can hold position, which trades range for the stability being trained.
Holding the breath throughout, which reduces the bracing the movement is meant to teach.

Frequently asked questions

Dead bug vs plank: which is better?

They train the core in different ways, and both are useful. A plank teaches your core to hold still against gravity. The dead bug teaches it to stay still while your arms and legs move, which is closer to how your core works in lifting and sport. Beginners often find the dead bug easier to do correctly.

Do dead bugs give you abs?

They make your abs stronger, but visible abs depend on body fat, not on any one exercise. The dead bug mainly trains the deep core and the lower part of your abs to stop your back arching. For bigger, more visible ab muscles, add loaded exercises like cable crunches or hanging leg raises as well.

Why does my back arch on dead bugs?

Because your arms and legs are moving further than your core can control yet. Breathe out fully and press your lower back into the floor before each rep. Then move only as far as you can without the back lifting. Bent knees and shorter reaches make it easier, and you can extend them as you get stronger.

Are dead bugs good for lower back pain?

They are a staple of lower back rehab, because they train the core without any load on the spine. Keep your lower back flat on the floor throughout. They should not hurt: if they do, shorten the range, and see a professional if the pain persists.

What muscles does the Dead Bug work?

The Dead Bug trains the core, and little else. No other group takes a meaningful share of the load, which is what makes this a clean way to target the core directly.

What equipment do I need for the Dead Bug?

None. The Dead Bug is a bodyweight movement, so your own weight is the resistance and floor space is the only requirement.

Is the Dead Bug suitable for beginners?

Yes. The Dead Bug is rated beginner: you are the load, so there is no weight to get wrong. Add reps or time only once the position holds from the first of them to the last.

Can I do the Dead Bug at home?

Yes, anywhere. There is nothing to buy and nothing to set up, which makes the Dead Bug one of the movements worth keeping for days you never reach a gym.

How many sets and reps of the Dead Bug should I do?

Three sets of 12 to 20 reps, or 30 to 60 seconds for anything you hold. Add load or leverage once the top end feels easy rather than piling on more reps.

What are good alternatives to the Dead Bug?

Cable Side Bend, Dumbbell Side Bend, and Machine Crunch train the same primary muscles as the Dead Bug. Pick whichever one suits the equipment in front of you.