Dead Bug Exercise: The Best Core Move You're Not Doing
How to do the dead bug exercise with perfect form: step-by-step, common mistakes, easier and harder versions, and why physios love it for core strength.
By Ayoub Farid · · 2 min read
The dead bug looks a little silly: on your back, arms and legs up like an upturned insect. But it's one of the most valuable core exercises there is. It teaches you to keep your spine still while your arms and legs move, which is exactly what your core needs to do in sport and daily life.
How to do a dead bug
- Lie on your back. Raise your arms straight toward the ceiling.
- Lift your legs so your knees are bent at 90°, shins parallel to the floor.
- Press your lower back gently into the floor and keep it there.
- Breathe out as you slowly lower your right arm overhead and extend your left leg toward the floor.
- Stop just before your back lifts. Return to the start.
- Repeat on the other side. That's one rep per side.
Go slowly: 3 seconds out, 3 seconds back.
Common mistakes
- Lower back arching: shorten the range
- Moving fast: slow down, that's where the work is
- Holding breath: exhale as you extend
- Only moving the leg or arm: coordinate both
Variations
| Easier | Standard | Harder |
|---|---|---|
| Heel taps (legs only, knees bent) | Opposite arm + leg | Straight-leg dead bug |
| Arms only | Holding a dumbbell or band | |
| Pause 3 s at full extension |
Sets and reps
Two or three sets of 6–10 slow reps per side. Use it as a warm-up, a main exercise for beginners, or a finisher.
Why physios love it
It trains the deep abdominal muscles and teaches pelvic control without loading the spine heavily. That's why it shows up in so many back-friendly and postpartum programs (with professional guidance). See ab workout without crunches and how to engage your core.
In AbBlitz, the dead bug is a core stability move with a hold-based timer, and it appears often in beginner plans.
A 4-week dead bug progression
| Week | Variation | Sets × reps |
|---|---|---|
| 1 | Heel taps (knees bent) | 3 × 8 per side |
| 2 | Opposite arm and leg | 3 × 8 per side |
| 3 | Straight-leg dead bug | 3 × 6 per side |
| 4 | Dead bug holding a light dumbbell | 3 × 8 per side |
Breathing makes it harder (in a good way)
Try this: before each rep, breathe out fully so your ribs drop and your lower back presses into the floor. Then move your arm and leg while taking a small breath in, without letting the back lift. Breathe out as you return. It's surprisingly challenging and teaches excellent core control.
Frequently asked questions
What muscles does the dead bug work?
Mainly the rectus abdominis and deep transverse abdominis, plus obliques and hip flexors.
Is the dead bug good for lower back pain?
It's commonly used in back-friendly programs, but persistent pain needs a professional assessment.
Why do I feel it in my hip flexors?
Your legs may be too low. Keep the range smaller and focus on pressing your back down.
Dead bug vs plank?
Both train stability. The dead bug adds limb movement and is often easier to do correctly. See plank guide.