Last week it was birds. This week it's a bug. Clearly the animal kingdom has been onto something we've been missing. The dead bug is an ab exercise with a terrible name and an exceptional résumé, and if you're not already doing it, here's why you should be.
Why Core Work Matters More Than You Think
Your core isn't just there to look good at the beach. It's the structural foundation everything else is built on.
Fall prevention and independence. Core strength is one of the most reliable predictors of fall prevention in older adults, one of the most consequential health risks after 50. A strong core keeps you getting up off the floor, carrying things, and moving without pain.
Better breathing. Your diaphragm and deep core muscles are closely connected. Training your core properly improves how you breathe under exertion, which matters for endurance, stress management, and sleep quality.
Everything else you do. Rotational power in golf and tennis. Stability in cycling. Force transfer in swimming. Your core is involved in all of it, whether you're training it or not.
How to Do It
Beginner
Start here, and don't rush out of it.
Dead bug hold - lie on your back, arms pointing at the ceiling, hips and knees at 90°. Hold the position and breathe. Focus entirely on keeping your lower back flat against the floor.
Single arm lowering - lower one arm overhead toward the floor and bring it back while the legs stay completely still.
Single leg extension - straighten one leg out low to the floor while the arms stay up.
Once you can do all three without your lower back lifting at all, move on.
Intermediate
Now you're adding coordination - opposite limbs moving together, which dramatically increases the rotational demand on your core.
Standard dead bug - opposite arm and leg extend simultaneously, slow and controlled, lower back glued to the floor.
Dead bug with resistance band - loop a band overhead and pull it down as your opposite leg extends. The added lat tension helps lock your ribcage down.
Dead bug with foam roller/ ball - press a foam roller or small swiss ball between your hands and knees and extend one leg while maintaining the squeeze. The feedback makes the brace significantly more demanding.
Advanced
Cable dead bug - set a cable high, grab it with both hands, and resist the pull trying to yank your ribcage up while you extend alternate legs. Brutal.
Dead bug with dumbbell pullover - hold a light dumbbell with both arms extended overhead and extend alternate legs. The lever arm on your ribs is enormous.
Straight leg lowering - both legs start pointing at the ceiling, fully extended. Lower one leg as close to the floor as possible without your back lifting. Deceptively difficult to do honestly.
The rule at every level: slow reps, exhale as you move, and your lower back never leaves the floor. If it does, regress and rebuild. No exceptions.
Why This Beats Most Other Ab Exercises
Your abs aren't primarily there to crunch - their main job is anti-movement: resisting extension, rotation, and lateral flexion while your limbs move. The dead bug trains exactly that. Every time you fight to keep your lower back flat while an arm and leg reach away, you're replicating what your core does during walking, lifting, carrying and throwing.
Compare that to crunches and sit-ups, which repeatedly flex the spine under load — a pattern most people who sit at a desk all day already have far too much of.
The dead bug also wins on safety. With your lumbar spine pressed into the floor throughout, there's zero spinal flexion under load, making it suitable for almost everyone, including those with back pain or disc issues.
And crucially, it's self-correcting. The floor gives you immediate feedback because the moment you lose tension, your back lifts and you know it. You can't fake good form, which makes it one of the most honest exercises in the gym.
How it stacks up:
Planks - great, but static. They don't train your core to stabilize while your limbs are moving, which is harder and more useful.
Leg raises - often hip flexor dominant, with the lower back doing more work than the abs.
Crunches/sit-ups - repeatedly load spinal flexion. Not what most people need more of.
Pallof press - excellent for anti-rotation specifically, but the dead bug covers anti-extension and anti-rotation simultaneously.
No exercise is perfect, but the dead bug comes as close as any to being safe, scalable, functionally relevant, and self-correcting all at once. That combination is genuinely rare.
So, what are you waiting for? Do like the dead bugs do and hit the floor. 🐛
Be inquisitive, be safe, and keep living the good life.
Sasha
Full Disclosure: I'm writing this as myself, not as a doctor or your personal trainer. This content is purely educational or my personal thoughts - not in place of medical or health professional advice or treatment. While I’m a Certified Personal Trainer, I’m not a healthcare provider. Seek advice from your health care practitioner before starting physical activity or making serious changes to your health. If you experience any pain or discomfort when participating in the activities, immediately stop and reach out to your health care professional. Please use at your own risk and proceed with caution.