Dead Bug Exercise: Build Core and Abdominal Strength
Movement card
| Body area | Lower back and core |
|---|---|
| Also called | dead bug |
| Works | lower back, core, abdominals |
| Type | Strength |
| Position | Floor |
| Hold | Not a hold |
| Reps | 5 to 10 |
| Sets | 1 |
| Sides | Each side |
| How often | A few times a week as part of a regular break or exercise routine. |
| Equipment | None, floor mat |
| Office visibility | Low |
The dead bug is a core exercise performed while lying on your back. It involves moving your opposite arm and leg simultaneously while keeping your torso and lower back stable against the floor.
People who sit for long periods sometimes use this movement to engage their abdominal muscles and build core stability without putting strain on the back.
What the dead bug exercise works
The dead bug exercise primarily works the deep muscles of your core and abdominals. It also helps to strengthen and stabilize your lower back. The goal is to keep your torso steady while your limbs are in motion.
How to do it
Starting position: Lie on your back with your knees bent over your hips and shins parallel to the floor. Extend your arms straight up toward the ceiling. Gently press your lower back into the floor to engage your core muscles.
- Exhale slowly as you lower your right arm and left leg toward the floor at the same time.
- Lower them only as far as you can while keeping your back flat on the floor.
- Inhale as you slowly bring your arm and leg back to the starting position.
- Repeat the movement with your left arm and right leg.
- Continue alternating sides with slow, controlled movements.
What you should feel
As you perform the movement, you should feel your abdominal muscles engaging to keep your torso stable. Your lower back should remain comfortably on the floor. You should not feel any pain or significant strain in your back.
Common mistakes
- Arching the lower back off the floor.
- Moving too quickly and using momentum instead of muscle control.
- Holding your breath.
- Letting your ribcage flare upwards.
Make it easier or harder
- Easier: Move only your legs, keeping your arms still.
- Easier: Move only your arms, keeping your legs still.
- Easier: Do not lower your limbs as far toward the floor.
- Easier: Seated variation: Sit tall in a chair. Engage your core. Slowly lift one knee up a few inches, then lower it with control. Alternate legs.
- Harder: Slow the movement down to increase time under tension.
- Harder: Straighten your legs more as you lower them.
Fitting it into a desk day
Because it is a floor exercise, the dead bug is best for a longer break when you have some private space. Its low visibility makes it a good option if you have an office with a door. A seated variation can be done discreetly at your desk anytime to reset your posture.
Quick questions
Why is my lower back arching off the floor?
Arching your back is a common mistake that can happen if your core is not engaged or if you lower your limbs too far. Try to lower your arm and leg only as far as you can while keeping your back flat on the floor.
How many reps of the dead bug should I do?
Start with one set of five to ten repetitions on each side. The focus should be on slow, controlled movements rather than a high number of reps.
Can I do the dead bug exercise at my desk?
The standard exercise is done on the floor. However, a seated variation can be performed discreetly in a chair by engaging your core and slowly lifting one knee at a time.
When to see a doctor or physio
Stop the exercise if you feel certain symptoms. It is a good idea to get checked by a doctor or physical therapist if you experience sharp, shooting, or radiating pain in your back or legs, or numbness or tingling in your legs or feet.
- Sharp, shooting, or radiating pain in your back or legs.
- Numbness or tingling in your legs or feet.
Skip it or ask first if:
- You have a recent back, hip, or abdominal injury or have had recent surgery in those areas.
- You are in the later stages of pregnancy.
- You have a specific spinal condition where this movement is not advised.
How this page was put together: general guidance consistent with public workstation and movement-break resources from OSHA, CDC/NIOSH and the NHS, and with standard exercise handouts. It was drafted with AI assistance, checked in a separate review pass and edited under our editorial policy. It is not medical advice and no clinician reviewed it. Last checked October 2026.