How to Do a Dead Bug Properly

To do a dead bug, lie on your back with your arms pointing at the ceiling and your hips and knees bent to 90 degrees, then slowly lower one arm and the opposite leg towards the floor while your lower back stays still. Breathe out as you reach, come back to the start, and switch sides. It is one of the best core exercises a beginner can learn, gentle on the joints and easy to scale, but it only works if you go slowly, and most people rush it. This guide, part of our series on doing the big movements properly, covers the muscles it works, step-by-step cues, a progression ladder, common mistakes and a 4-week plan that fits around your running.

What is a dead bug exercise?

The name comes from the start position: on your back with your arms and legs in the air, you look a bit like a beetle that has flipped over. It needs no kit beyond a mat, and you will see it in gym warm-ups, physio clinics and running strength routines alike. It is also one of the six moves in our guide to the best core exercises for beginners, alongside planks, bridges and bird dogs.

What muscles does a dead bug work?

The dead bug is what coaches call an anti-extension exercise. Instead of curling your spine like a sit-up, your job is to stop it moving. As your arm and leg reach away from you, their weight tries to pull your lower back into an arch, and your stomach muscles work to stop that happening.

• Rectus abdominis. The six-pack muscle at the front, which resists your back arching.
• Transverse abdominis. A deep muscle that wraps around your waist like a belt and helps keep your middle stiff.
• Obliques. The muscles down your sides, which stop your ribs and pelvis twisting or tipping as opposite limbs move.
• Hip flexors and shoulders. They move and hold your legs and arms, but they are supporting players here.
• Diaphragm. Breathing out slowly while you stay braced is a big part of the skill.

Because you move the opposite arm and leg, the pattern loosely mirrors walking and running, where your right arm swings forward as your left leg does. That is one reason it is popular with runners, something we go into in more detail in our piece on core training for runners.

How do you do a dead bug with good form?

These cues are for the classic version, with opposite arm and leg moving together.

• Lie down. Lie on your back on a mat with your knees bent and your feet flat. Rest your head on the floor.
• Arms up. Reach both arms straight up so your hands are directly above your shoulders, fingers pointing at the ceiling.
• Legs up. Lift one leg at a time until your knees are directly above your hips, bent to about 90 degrees, with your shins level with the floor. This is called the tabletop position.
• Set your back. Gently draw your ribs down towards your hips so your lower back rests lightly on the floor. You do not need to crush it into the mat. What matters is that it stays still for the whole set.
• Breathe and brace. Breathe in through your nose, then tighten your stomach as if someone were about to poke you in the belly.
• Reach. Breathe out slowly as you lower your right arm back towards the floor behind your head and straighten your left leg out towards the floor. Take 2 to 3 seconds.
• Stop short. Stop with your hand and heel just above the floor, or sooner if your back starts to lift or your ribs pop up.
• Return and switch. Bring them back to the start over 2 to 3 seconds, take a fresh breath, then repeat with your left arm and right leg.

A practical tip: slide a folded towel under your lower back and keep the same light pressure on it throughout. If the pressure disappears, your back has arched and the reach is too long for today.

What is the best dead bug progression for beginners?

A dead bug gets harder the further your arms and legs travel from your middle, so the ladder works by lengthening that reach one step at a time. Start on the first rung where you can do every rep without your back lifting.

• Rung 1: Tabletop hold. Get into the start position and simply hold it for 20 to 30 seconds while breathing slowly, keeping your back still. Done properly, you will feel your stomach working.
• Rung 2: Heel taps. From the tabletop, keep your knee bent at 90 degrees and slowly lower one foot until your heel lightly touches the floor, then bring it back. Your arms stay pointing at the ceiling. Alternate legs.
• Rung 3: Leg reach. Like a heel tap, but straighten your leg as you lower it so it ends up hovering just above the floor. Arms still stay up.
• Rung 4: Classic dead bug. Opposite arm and leg together, exactly as described above.
• Rung 5: Harder dead bug. Add a 2-second pause at full reach, or hold a light dumbbell or kettlebell straight above your chest with both hands while only your legs move.

Move up a rung when you can do 3 sets of 8 to 10 reps each side at your current level with your back staying still on every rep. A clean heel tap beats a full dead bug with an arching back.

What are the most common dead bug mistakes, and how do you fix them?

• Back arching off the floor. The big one. It means the reach is too long for your strength right now. Shorten it, stop higher above the floor, or drop down a rung.
• Rushing. Speed hides weakness. Count 2 to 3 seconds out and 2 to 3 seconds back.
• Holding your breath. Breathe out slowly through pursed lips as you reach, then breathe in as you come back.
• Same arm, same leg. It is opposite arm and opposite leg. If you lose track, say ‘right arm, left leg’ in your head before each rep.
• Ribs popping up. As your arm goes overhead, your ribs can lift and your back arches with them. Only take your arm as far as your ribs stay down.
• Lifting your head. Craning forward to watch your legs strains your neck. Rest your head on the floor and look at the ceiling.
• Drifting legs. The resting leg creeps towards your chest. Keep that knee stacked above your hip.

How many sets and reps of dead bugs should you do?

• Starting out. 2 to 3 sets of 5 to 6 reps each side, resting 30 to 60 seconds between sets.
• Building up. 3 sets of 8 to 10 reps each side.
• Tempo. 2 to 3 seconds out, 2 to 3 seconds back, with a breath between reps.
• How often. 2 to 3 times a week is plenty. It takes about five minutes.

End the set when your form starts to fade, not when you hit a number.

What does a 4-week beginner dead bug plan look like?

Follow this plan two or three times a week with at least a day in between, for example Monday, Wednesday and Friday. Rest for 30 to 60 seconds between sets. If a week feels too hard, repeat it. Everyone moves at a different speed.

By the end of week 4 you should have a controlled classic dead bug. If not, stay on heel taps or leg reaches for another week or two. That is completely normal.

How do dead bugs fit into a hybrid week with running?

Easily. Dead bugs ask very little of your legs and only take a few minutes, so they slot in almost anywhere without getting in the way of your running.

• Before a strength session. One or two slow sets as part of your warm-up get your middle working before squats, lunges or deadlifts.
• After an easy run. Add a five-minute core block while you are still warm. Dead bugs pair well with a glute bridge and a plank (our guide on how to do a plank properly covers that one).
• On an easy day. A short floor routine is gentle enough for most people and keeps the habit going.

The one thing to avoid is a hard core session right before a long run or a fast session, when you want your trunk fresh.

Will dead bugs make you a faster runner on their own? Probably not. Think of them as one useful piece of a joined-up plan that also includes your running, leg strength and recovery. That is how Edge works: running, strength and HIIT as one plan, so core work sits alongside your runs instead of competing with them. Edge is free to use, and Edge Pro, from £19.99 a month with a free 7-day trial (a card is needed to start it), gives you a fully personalised plan across running, strength, HIIT and mobility, ready within 24 hours, with a real coach to message anytime if you are not sure when to move up a rung. Edge has 20,000+ members.

This article is general guidance, not medical advice. If you are new to exercise, returning from injury, or managing a health condition, speak to your GP before starting, and see a physio for any niggle that does not settle.