Core 3 - The Floor Routine I Switched To After McGill's Big Three

I’m not a physiotherapist. I sit for work - laptop on a stand, external keyboard, the usual desk setup. My back gets stiff after long WordPress build weeks where I skip lunch breaks and barely stand up between commits. For a while Stuart McGill’s Big Three lived in a phone folder next to the kitchen charger. Bookmarked. Respected. Glad I found it - not a daily habit.

Then I swapped to something I call Core 3 - dead bug, side plank, glute bridge. Same five to ten minutes. No gym. Easier to get right on tired evenings. Glad I stopped treating “clinical and correct” as the same thing as “something I’ll actually do.”

Not medical advice. If you’re injured, see a professional. This is what I run on stiff days now - and when McGill still wins.

McGill Big Three is effective - and not always the best default

McGill’s trio - modified curl-up, side plank, bird dog - trains spinal endurance and bracing without grinding your spine through crunch reps. Strong evidence for chronic nonspecific low back pain. Low equipment. Low risk when form is honest.

I needed that lesson. Years of sit-ups and ab-wheel clips left my lower back worse, not better. McGill fixed my mental model: stabilize, don’t flex for reps.

What McGill did not fix was adherence. The curl-up is easy to turn back into a crunch. Bird dog takes coordination I rush when the commit queue is still open in my head. I kept opening the folder labeled “back” and closing it again.

Core 3 keeps McGill’s spine-safe idea - train endurance without irritating the back - but swaps two moves for ones I learn faster and stick with. Side plank stays. Dead bug replaces bird dog. Glute bridge adds hip strength, which long desk days starve.

Dead bug

Goal: hold your trunk steady while opposite arm and leg move. Anti-extension without the bird-dog balance puzzle.

Lie on your back, arms toward the ceiling, knees bent at ninety degrees like you’re sitting on an invisible chair. Press your low back gently into the floor. Extend opposite arm and leg slowly - only as far as you can without your back arching off the mat. Return. Switch sides.

My first dead bugs were bird dogs lying down - leg shooting out, back lifting, breath held. The cue that fixed it: low back stays glued to the floor. Smaller reach beats a dramatic kick.

Easier progression than bird dog for me. Same anti-slouch lesson. Less “cup of water on my spine” anxiety because I’m already on the floor.

Dead bug demo - watch the low back stay flat, not how far the leg reaches.

Side plank

Goal: lateral core and hip stability - the side that collapses when you sit crooked for three hours.

Forearm on the floor, body in a straight line. Knees down if the full plank turns into a banana. Ten to twenty seconds done well beats a saggy minute.

I failed this one on pride first. Chased a minute each side. Hips drooped by twenty seconds. Reset: shorter holds, hips forward, neck neutral. Stop when the line breaks.

This move survived the pivot unchanged. It’s the overlap between McGill and Core 3 for a reason.

Side plank demo - watch the hips. That’s where I cheat.

Glute bridge

Goal: wake up the hips and posterior chain. Long sitting kills glute endurance; weak hips dump load into the low back.

Lie on your back, knees bent, feet flat. Drive through your heels, squeeze your glutes, lift hips until shoulders-knees-hips make a line. Pause at the top. Lower with control. Don’t hyperextend at the top - you’re building support, not auditioning for a backbend.

I skipped bridges for years because they looked too easy. That was the point. After a week of honest reps, standing up from my desk chair felt less like unfolding a lawn chair.

Glute bridge demo - pelvic tilt first, glutes do the lift, not the low back.

Why Core 3 beats McGill Big Three (for me)

McGill Big Three is effective. I am not dumping on it. For recurring low back pain, McGill’s exact protocol still has the stronger research lane. I keep it for flare-up weeks.

For a default floor routine I will actually run after a desk day, Core 3 wins on the things that kept McGill bookmarked instead of done.

The honest trade: McGill optimizes for a fragile spine under a researcher’s protocol. Core 3 optimizes for a routine a tired developer will repeat. A habit you do beats a perfect circuit you bookmark - that is why I switched.

How I run Core 3

Two or three rounds. Boring on purpose.

Frequency: most weekdays, or a micro-session when I’ve been desk-bound. Not heroics - consistency.

Breathing: exhale on the effort. I still hold my breath on side plank like I’m deadlifting a car. Weekly reset.

When I reach for McGill instead: back feels specifically fragile, not just stiff from sitting. Flare-up weeks. Curl-up and bird dog go back in the rotation because McGill built them for that lane.

I keep both demo sets on the phone now. Core 3 is the default folder. McGill is the “be careful” folder. Either beats another afternoon pretending the desk hunch is fine.

Low back care doesn’t need fancy equipment. Dead bug, side plank, glute bridge - form over ego, short holds over saggy minutes, hips included.

Glad McGill taught me what crunches were doing wrong. Glad Core 3 is the circuit I actually open before I sit down again.