The dead bug builds deep core control while your back stays supported on the floor. Steps, reps, progressions and safety from a physiotherapist.
The dead bug is a core exercise done lying on your back: you extend the opposite arm and leg slowly while keeping your lower back gently pressed to the floor. It trains the deep abdominal muscles to hold the spine steady while your limbs move. Do two sets of 6 to 10 slow reps per side.
Why is the dead bug so useful?
A strong core is not about a flat stomach. It is about the trunk muscles being able to hold the spine steady while your arms and legs do work, which is what happens when you walk, reach, lift and turn. The dead bug trains this on the floor, where your back is supported and you can concentrate on control without worrying about balance.
That makes it suitable for beginners, people returning after a layoff and many older adults. It teaches you to feel the difference between moving from the hips and shoulders and moving from the lower back. It is also an excellent partner for bird dog, which trains the same control on hands and knees.
Exercise is recommended for people with persistent low back pain. A 2020 network meta-analysis of exercise types found that several approaches help, and none was clearly superior in every comparison, so the best exercise is one you can do correctly and consistently. See exercise for chronic back pain.
How to do the dead bug step by step
- Lie down. Lie on your back on a mat. Bend your hips and knees to 90 degrees with your shins parallel to the floor, as if sitting in a chair in the air.
- Reach up. Extend both arms straight up towards the ceiling, directly over your shoulders.
- Set your trunk. Breathe out and gently draw your lower ribs down, so your lower back is lightly pressed into the mat. Keep your chin slightly tucked.
- Extend. Slowly lower one arm overhead and straighten the opposite leg, as if reaching it away from you, over two to three seconds. Go only as far as your back can stay flat.
- Return. Bring the arm and leg back to the start with control.
- Alternate. Repeat on the other side.
Breathe out as you extend, in as you return. Do not hold your breath.
A simple check
Slide your hand under your lower back before you start. You should feel light pressure from the floor. As you extend, that pressure should not disappear. If it does, your back is arching, and you need to reduce the range.
Sets, reps and progression
| Stage | Exercise | Prescription |
|---|---|---|
| 1 | Heel taps: knees bent at 90, lower one foot to tap the floor, alternate | 2 x 8 to 10 each side |
| 2 | Leg only: extend one leg at a time, arms up | 2 x 6 to 8 each side |
| 3 | Opposite arm and leg together | 2 x 6 to 10 each side |
| 4 | Slower tempo (four seconds out, four back) | 2 to 3 x 6 to 8 each side |
| 5 | Light band or weight in the hands | 2 to 3 x 6 to 8 each side |
Rest 30 to 45 seconds between sets. Train two to three times a week. Progress only when your lower back stays flat throughout.
Common mistakes
- Back arching off the floor. This is the main error. Reduce the range, exhale and tuck your ribs.
- Moving too fast. Slow control is the exercise.
- Holding your breath. Breathe out as you extend.
- Letting the ribs flare as the arm moves overhead. Keep your lower ribs down.
- Dropping the leg to the floor. Hover it a hand’s width above.
- Neck strain. Keep the head resting on the mat, or on a small pillow if you need to.
Easier and harder versions
Easier
- Heel taps only, or just move the arms.
- Keep the arm movement small.
- Place a small pillow under the head.
- Place your feet flat on the floor and slide one heel away (a “bent-knee heel slide”).
Harder
- Slower tempo and longer holds in the extended position.
- Hold a light dumbbell or small ball in the hands.
- Put a resistance band around your feet or hands.
- Straighten the leg further from the floor.
Where does it fit in your routine?
Use the dead bug as a warm-up or at the start of a core block, followed by the bird dog and a suitcase carry. It supports the glute bridge and hip hinge by teaching you to keep the spine steady. For the deeper muscles, see pelvic floor and core as you age and our balance and stability pillar. If you cannot get up from the floor easily afterwards, see how to get up from the floor.
Safety and when to get advice
- Use a mat or carpeted surface. Make sure you can get down and up from the floor safely.
- Keep every rep pain-free. Mild abdominal fatigue is normal. Sharp back, hip or neck pain is not.
- Seek advice before starting if you have back pain with leg symptoms, a recent spine injury, a recent abdominal or hip surgery, a hernia, a diastasis (abdominal separation) after pregnancy, or are in late pregnancy when lying flat on the back may not be advised.
- Seek urgent care for back pain with new numbness in the groin, loss of bladder or bowel control, new leg weakness or fever.
- Stop for chest pain, dizziness or breathlessness out of proportion to the effort.
Key takeaways
- The dead bug trains the deep core to hold the spine steady while the limbs move, with your back supported.
- Keep your lower back lightly pressed to the floor, exhale as you extend and move for two to three seconds each way.
- Do two sets of 6 to 10 per side, two to three days a week, and reduce the range whenever your back arches.
- Progress from heel taps to leg-only, to arm and leg together and then to a light load.
- Leg symptoms, bladder or bowel changes or a recent surgery need medical review first.
If you would like a core programme matched to your back and your goals, we run home-visit assessments across KL and Selangor.